diff --git a/CHANGELOG b/CHANGELOG
index 7e98bf6dd..d17051826 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -133,6 +133,7 @@
   used method by setting a parameter in the extension's config file will no
   longer work.
 - clean up code for managing extensions
+- fix renaming of folders via webdav
 
 --------------------------------------------------------------------------------
                      Changes in version 5.1.13
diff --git a/SeedDMS_Core/Core/inc.ClassDocument.php b/SeedDMS_Core/Core/inc.ClassDocument.php
index 2ba8f140b..2bfd0a9d3 100644
--- a/SeedDMS_Core/Core/inc.ClassDocument.php
+++ b/SeedDMS_Core/Core/inc.ClassDocument.php
@@ -3398,7 +3398,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 
 	function getUser() { /* {{{ */
 		if (!isset($this->_user))
-			$this->_user = $this->_document->_dms->getUser($this->_userID);
+			$this->_user = $this->_document->getDMS()->getUser($this->_userID);
 		return $this->_user;
 	} /* }}} */
 
@@ -3414,7 +3414,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	function getPath() { return $this->_document->getDir() . $this->_version . ($this->_fileType != '.' ? $this->_fileType : ''); }
 
 	function setRevisionDate($date = false) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$date)
 			$queryStr = "UPDATE `tblDocumentContent` SET `revisiondate` = null WHERE `document` = " . $this->_document->getID() .	" AND `version` = " . $this->_version;
@@ -3431,7 +3431,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function setDate($date = false) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$date)
 			$date = time();
@@ -3461,7 +3461,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 		if($filesize === false)
 			return false;
 
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 		$queryStr = "UPDATE `tblDocumentContent` SET `fileSize` = ".$filesize." where `document` = " . $this->_document->getID() .  " AND `version` = " . $this->_version;
 		if (!$db->getResult($queryStr))
 			return false;
@@ -3482,7 +3482,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 		if($checksum === false)
 			return false;
 
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 		$queryStr = "UPDATE `tblDocumentContent` SET `checksum` = ".$db->qstr($checksum)." where `document` = " . $this->_document->getID() .  " AND `version` = " . $this->_version;
 		if (!$db->getResult($queryStr))
 			return false;
@@ -3492,7 +3492,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function setComment($newComment) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr = "UPDATE `tblDocumentContent` SET `comment` = ".$db->qstr($newComment)." WHERE `document` = " . $this->_document->getID() .	" AND `version` = " . $this->_version;
 		if (!$db->getResult($queryStr))
@@ -3527,7 +3527,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array latest record from tblDocumentStatusLog
 	 */
 	function getStatus($limit=1) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -3561,7 +3561,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of status changes
 	 */
 	function getStatusLog($limit=0) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -3596,7 +3596,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function setStatus($status, $comment, $updateUser, $date='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($status)) return false;
 
@@ -3652,7 +3652,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function rewriteStatusLog($statuslog) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr= "SELECT `tblDocumentStatus`.* FROM `tblDocumentStatus` WHERE `tblDocumentStatus`.`documentID` = '". $this->_document->getID() ."' AND `tblDocumentStatus`.`version` = '". $this->_version ."' ";
 		$res = $db->getResultArray($queryStr);
@@ -3711,7 +3711,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer either M_NONE or M_READ
 	 */
 	function getAccessMode($u) { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 
 		/* Check if 'onCheckAccessDocumentContent' callback is set */
 		if(isset($this->_dms->callbacks['onCheckAccessDocumentContent'])) {
@@ -3843,7 +3843,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of review status
 	 */
 	function getReviewStatus($limit=1) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -3903,7 +3903,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function rewriteReviewLog($reviewers) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr= "SELECT `tblDocumentReviewers`.* FROM `tblDocumentReviewers` WHERE `tblDocumentReviewers`.`documentID` = '". $this->_document->getID() ."' AND `tblDocumentReviewers`.`version` = '". $this->_version ."' ";
 		$res = $db->getResultArray($queryStr);
@@ -3971,7 +3971,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of approval status
 	 */
 	function getApprovalStatus($limit=1) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -4031,7 +4031,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function rewriteApprovalLog($reviewers) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr= "SELECT `tblDocumentApprovers`.* FROM `tblDocumentApprovers` WHERE `tblDocumentApprovers`.`documentID` = '". $this->_document->getID() ."' AND `tblDocumentApprovers`.`version` = '". $this->_version ."' ";
 		$res = $db->getResultArray($queryStr);
@@ -4099,7 +4099,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of receipts
 	 */
 	function getReceiptStatus($limit=1) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -4175,7 +4175,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function rewriteReceiptLog($recipients) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr= "SELECT `tblDocumentRecipients`.* FROM `tblDocumentRecipients` WHERE `tblDocumentRecipients`.`documentID` = '". $this->_document->getID() ."' AND `tblDocumentRecipients`.`version` = '". $this->_version ."' ";
 		$res = $db->getResultArray($queryStr);
@@ -4243,7 +4243,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of revisions
 	 */
 	function getRevisionStatus($limit=1) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!is_numeric($limit)) return false;
 
@@ -4298,7 +4298,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean 0 on success, otherwise a negativ error number
 	 */
 	function rewriteRevisionLog($revisions) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr= "SELECT `tblDocumentRevisors`.* FROM `tblDocumentRevisors` WHERE `tblDocumentRevisors`.`documentID` = '". $this->_document->getID() ."' AND `tblDocumentRevisors`.`version` = '". $this->_version ."' ";
 		$res = $db->getResultArray($queryStr);
@@ -4359,7 +4359,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function addIndReviewer($user, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$userID = $user->getID();
 
@@ -4410,7 +4410,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function addGrpReviewer($group, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -4488,7 +4488,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer new review log id
 	 */
 	function setReviewByInd($user, $requestUser, $status, $comment, $file='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the review list.
 		$reviewStatus = $user->getReviewStatus($this->_document->getID(), $this->_version);
@@ -4540,7 +4540,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer new review log id
 	 */
 	function setReviewByGrp($group, $requestUser, $status, $comment, $file='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the review list.
 		$reviewStatus = $group->getReviewStatus($this->_document->getID(), $this->_version);
@@ -4579,7 +4579,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
  } /* }}} */
 
 	function addIndApprover($user, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$userID = $user->getID();
 
@@ -4628,7 +4628,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function addGrpApprover($group, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -4710,7 +4710,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer 0 on success, < 0 in case of an error
 	 */
 	function setApprovalByInd($user, $requestUser, $status, $comment, $file='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the approval list.
 		$approvalStatus = $user->getApprovalStatus($this->_document->getID(), $this->_version);
@@ -4754,7 +4754,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * group instead of a user
 	 */
 	function setApprovalByGrp($group, $requestUser, $status, $comment, $file='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the approval list.
 		$approvalStatus = $group->getApprovalStatus($this->_document->getID(), $this->_version);
@@ -4792,7 +4792,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
  } /* }}} */
 
 	function addIndRecipient($user, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$userID = $user->getID();
 
@@ -4843,7 +4843,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function addGrpRecipient($group, $requestUser) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -4916,7 +4916,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer 0 if successful otherwise a value < 0
 	 */
 	function addRevisor($object, $requestUser) { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 		$db = $dms->getDB();
 
 		/* getRevisionStatus() returns an array with either an element
@@ -5025,7 +5025,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer new receipt log id
 	 */
 	function setReceiptByInd($user, $requestUser, $status, $comment) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the review list.
 		$receiptStatus = $user->getReceiptStatus($this->_document->getID(), $this->_version);
@@ -5073,7 +5073,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return integer new receipt log id
 	 */
 	function setReceiptByGrp($group, $requestUser, $status, $comment) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the recipient list.
 		$receiptStatus = $group->getReceiptStatus($this->_document->getID(), $this->_version);
@@ -5139,7 +5139,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * -5: the revision has not been started at all.
 	 */
 	function setRevision($object, $requestUser, $status, $comment) { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 		$db = $dms->getDB();
 
 		/* getRevisionStatus() returns an array with either an element
@@ -5200,7 +5200,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delIndReviewer($user, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		// Check to see if the user can be removed from the review list.
 		$reviewStatus = $user->getReviewStatus($this->_document->getID(), $this->_version);
@@ -5230,7 +5230,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delGrpReviewer($group, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -5261,7 +5261,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delIndApprover($user, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$userID = $user->getID();
 
@@ -5293,7 +5293,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delGrpApprover($group, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -5324,7 +5324,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delIndRecipient($user, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$userID = $user->getID();
 
@@ -5356,7 +5356,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	} /* }}} */
 
 	function delGrpRecipient($group, $requestUser, $msg='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$groupID = $group->getID();
 
@@ -5406,7 +5406,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *
 	 */
 	function delRevisor($object, $requestUser, $msg='') { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 		$db = $dms->getDB();
 
 		/* getRevisionStatus() returns an array with either an element
@@ -5480,7 +5480,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param string $msg message saved for the initial log message
 	 */
 	function startRevision($requestUser, $msg='') { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 		$db = $dms->getDB();
 
 		$revisionStatus = self::getRevisionStatus();
@@ -5547,7 +5547,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param string $msg message saved in document status log
 	 */
 	function finishRevision($requestUser, $docstatus, $msg='', $docmsg='') { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 		$db = $dms->getDB();
 
 		$revisionStatus = self::getRevisionStatus();
@@ -5600,7 +5600,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param object $state
 	 */
 	function setWorkflowState($state) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if($this->_workflow) {
 			$queryStr = "UPDATE `tblWorkflowDocumentContent` set `state`=". $state->getID() ." WHERE `id`=". $this->_workflow['id'];
@@ -5620,7 +5620,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *         or false in case of error, e.g. the version has not a workflow
 	 */
 	function getWorkflowState() { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$this->_workflow)
 			$this->getWorkflow();
@@ -5635,7 +5635,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 			if (is_bool($recs) && !$recs)
 				return false;
 			$this->_workflowState = new SeedDMS_Core_Workflow_State($recs[0]['id'], $recs[0]['name'], $recs[0]['maxtime'], $recs[0]['precondfunc'], $recs[0]['documentstatus']);
-			$this->_workflowState->setDMS($this->_document->_dms);
+			$this->_workflowState->setDMS($this->_document->getDMS());
 		}
 		return $this->_workflowState;
 	} /* }}} */
@@ -5646,7 +5646,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param object $workflow
 	 */
 	function setWorkflow($workflow, $user) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$this->getWorkflow();
 		if($this->_workflow)
@@ -5690,7 +5690,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *         or false in case of error, e.g. the version has not a workflow
 	 */
 	function getWorkflow() { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if (!isset($this->_workflow)) {
 			$queryStr=
@@ -5703,8 +5703,8 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 				return false;
 			if(!$recs)
 				return false;
-			$this->_workflow = array('id'=>(int)$recs[0]['wdcid'], 'parent'=>(int)$recs[0]['parent'], 'workflow'=>new SeedDMS_Core_Workflow($recs[0]['id'], $recs[0]['name'], $this->_document->_dms->getWorkflowState($recs[0]['initstate']), $recs[0]["layoutdata"]));
-			$this->_workflow['workflow']->setDMS($this->_document->_dms);
+			$this->_workflow = array('id'=>(int)$recs[0]['wdcid'], 'parent'=>(int)$recs[0]['parent'], 'workflow'=>new SeedDMS_Core_Workflow($recs[0]['id'], $recs[0]['name'], $this->_document->getDMS()->getWorkflowState($recs[0]['initstate']), $recs[0]["layoutdata"]));
+			$this->_workflow['workflow']->setDMS($this->_document->getDMS());
 		}
 		return $this->_workflow['workflow'];
 	} /* }}} */
@@ -5720,7 +5720,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true on success, otherwise false
 	 */
 	function rewriteWorkflowLog($workflowlog) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		/* Get the workflowdocumentcontent */
 		$queryStr = "SELECT `id` FROM `tblWorkflowDocumentContent` WHERE `tblWorkflowDocumentContent`.`document` = '". $this->_document->getID() ."' AND `tblWorkflowDocumentContent`.`version` = '". $this->_version ."'";
@@ -5765,7 +5765,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *         or false in case of error
 	 */
 	function rewindWorkflow() { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$this->getWorkflow();
 
@@ -5808,7 +5808,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *         or false in case of error
 	 */
 	function removeWorkflow($user, $unlink=false) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$this->getWorkflow();
 
@@ -5861,7 +5861,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param object $subworkflow
 	 */
 	function getParentWorkflow() { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		/* document content must be in a workflow */
 		$this->getWorkflow();
@@ -5880,7 +5880,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 			return false;
 
 		if($recs[0]['workflow'])
-			return $this->_document->_dms->getWorkflow((int)$recs[0]['workflow']);
+			return $this->_document->getDMS()->getWorkflow((int)$recs[0]['workflow']);
 
 		return false;
 	} /* }}} */
@@ -5891,7 +5891,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param object $subworkflow
 	 */
 	function runSubWorkflow($subworkflow) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		/* document content must be in a workflow */
 		$this->getWorkflow();
@@ -5925,7 +5925,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @param string comment for the transition trigger
 	 */
 	function returnFromSubWorkflow($user, $transition=null, $comment='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		/* document content must be in a workflow */
 		$this->getWorkflow();
@@ -5974,7 +5974,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return boolean true if user may trigger transaction
 	 */
 	function triggerWorkflowTransitionIsAllowed($user, $transition) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$this->_workflow)
 			$this->getWorkflow();
@@ -6116,7 +6116,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 *         false in case of an error
 	 */
 	function triggerWorkflowTransition($user, $transition, $comment='') { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$this->_workflow)
 			$this->getWorkflow();
@@ -6261,7 +6261,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of operations
 	 */
 	function getWorkflowLog($transition = null) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$this->_workflow)
 			$this->getWorkflow();
@@ -6280,8 +6280,8 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 
 		$workflowlogs = array();
 		for ($i = 0; $i < count($resArr); $i++) {
-			$workflow = $this->_document->_dms->getWorkflow($resArr[$i]["workflow"]);
-			$workflowlog = new SeedDMS_Core_Workflow_Log($resArr[$i]["id"], $this->_document->_dms->getDocument($resArr[$i]["document"]), $resArr[$i]["version"], $workflow, $this->_document->_dms->getUser($resArr[$i]["userid"]), $workflow->getTransition($resArr[$i]["transition"]), $resArr[$i]["date"], $resArr[$i]["comment"]);
+			$workflow = $this->_document->getDMS()->getWorkflow($resArr[$i]["workflow"]);
+			$workflowlog = new SeedDMS_Core_Workflow_Log($resArr[$i]["id"], $this->_document->getDMS()->getDocument($resArr[$i]["document"]), $resArr[$i]["version"], $workflow, $this->_document->getDMS()->getUser($resArr[$i]["userid"]), $workflow->getTransition($resArr[$i]["transition"]), $resArr[$i]["date"], $resArr[$i]["comment"]);
 			$workflowlog->setDMS($this);
 			if($this->_workflow && $transition)
 				$workflowlogs[] = $workflowlog;
@@ -6299,7 +6299,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 	 * @return array list of operations
 	 */
 	function getLastWorkflowTransition() { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$this->_workflow)
 			$this->getWorkflow();
@@ -6316,7 +6316,7 @@ class SeedDMS_Core_DocumentContent extends SeedDMS_Core_Object { /* {{{ */
 
 		$workflowlogs = array();
 		$i = 0;
-		$workflowlog = new SeedDMS_Core_Workflow_Log($resArr[$i]["id"], $this->_document->_dms->getDocument($resArr[$i]["document"]), $resArr[$i]["version"], $this->_workflow, $this->_document->_dms->getUser($resArr[$i]["userid"]), $this->_workflow->getTransition($resArr[$i]["transition"]), $resArr[$i]["date"], $resArr[$i]["comment"]);
+		$workflowlog = new SeedDMS_Core_Workflow_Log($resArr[$i]["id"], $this->_document->getDMS()->getDocument($resArr[$i]["document"]), $resArr[$i]["version"], $this->_workflow, $this->_document->getDMS()->getUser($resArr[$i]["userid"]), $this->_workflow->getTransition($resArr[$i]["transition"]), $resArr[$i]["date"], $resArr[$i]["comment"]);
 		$workflowlog->setDMS($this);
 
 		return $workflowlog;
@@ -6435,8 +6435,9 @@ class SeedDMS_Core_DocumentLink { /* {{{ */
 	 * @return bool|SeedDMS_Core_User
 	 */
 	function getUser() {
-		if (!isset($this->_user))
-			$this->_user = $this->_document->_dms->getUser($this->_userID);
+		if (!isset($this->_user)) {
+			$this->_user = $this->_document->getDMS()->getUser($this->_userID);
+		}
 		return $this->_user;
 	}
 
@@ -6612,7 +6613,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @param string $newComment string new comment of document
 	 */
 	function setComment($newComment) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr = "UPDATE `tblDocumentFiles` SET `comment` = ".$db->qstr($newComment)." WHERE `document` = ".$this->_document->getId()." AND `id` = ". $this->_id;
 		if (!$db->getResult($queryStr))
@@ -6635,7 +6636,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @return boolean true on success
 	 */
 	function setDate($date) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!$date)
 			$date = time();
@@ -6682,7 +6683,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @param $newComment string new name of document
 	 */
 	function setName($newName) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr = "UPDATE `tblDocumentFiles` SET `name` = ".$db->qstr($newName)." WHERE `document` = ".$this->_document->getId()." AND `id` = ". $this->_id;
 		if (!$db->getResult($queryStr))
@@ -6697,7 +6698,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 */
 	function getUser() {
 		if (!isset($this->_user))
-			$this->_user = $this->_document->_dms->getUser($this->_userID);
+			$this->_user = $this->_document->getDMS()->getUser($this->_userID);
 		return $this->_user;
 	}
 
@@ -6719,7 +6720,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @param $newComment string new version of document
 	 */
 	function setVersion($newVersion) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		if(!is_numeric($newVersion) && $newVersion != '')
 			return false;
@@ -6743,7 +6744,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @param $newComment string new comment of document
 	 */
 	function setPublic($newPublic) { /* {{{ */
-		$db = $this->_document->_dms->getDB();
+		$db = $this->_document->getDMS()->getDB();
 
 		$queryStr = "UPDATE `tblDocumentFiles` SET `public` = ".($newPublic ? 1 : 0)." WHERE `document` = ".$this->_document->getId()." AND `id` = ". $this->_id;
 		if (!$db->getResult($queryStr))
@@ -6765,7 +6766,7 @@ class SeedDMS_Core_DocumentFile { /* {{{ */
 	 * @return integer either M_NONE or M_READ
 	 */
 	function getAccessMode($u) { /* {{{ */
-		$dms = $this->_document->_dms;
+		$dms = $this->_document->getDMS();
 
 		/* Check if 'onCheckAccessDocumentLink' callback is set */
 		if(isset($this->_dms->callbacks['onCheckAccessDocumentFile'])) {
diff --git a/controllers/class.Login.php b/controllers/class.Login.php
index d65415118..f5a902f8f 100644
--- a/controllers/class.Login.php
+++ b/controllers/class.Login.php
@@ -85,30 +85,35 @@ class SeedDMS_Controller_Login extends SeedDMS_Controller_Common {
 		}
 
 		/* Deprecated: Run any additional authentication implemented in a hook */
-		if(!$user && isset($GLOBALS['SEEDDMS_HOOKS']['authentication'])) {
+		if(!is_object($user) && isset($GLOBALS['SEEDDMS_HOOKS']['authentication'])) {
 			foreach($GLOBALS['SEEDDMS_HOOKS']['authentication'] as $authObj) {
 				if(!$user && method_exists($authObj, 'authenticate')) {
 					$user = $authObj->authenticate($dms, $settings, $login, $pwd);
+					if(false === $user) {
+						if(empty($this->errormsg))
+							$this->setErrorMsg("authentication_failed");
+						return false;
+					}
 				}
 			}
 		}
 
 		/* Authenticate against LDAP server {{{ */
-		if (!$user && isset($settings->_ldapHost) && strlen($settings->_ldapHost)>0) {
+		if (!is_object($user) && isset($settings->_ldapHost) && strlen($settings->_ldapHost)>0) {
 			require_once("../inc/inc.ClassLdapAuthentication.php");
 			$authobj = new SeedDMS_LdapAuthentication($dms, $settings);
 			$user = $authobj->authenticate($login, $pwd);
 		} /* }}} */
 
 		/* Authenticate against SeedDMS database {{{ */
-		if(!$user) {
+		if(!is_object($user)) {
 			require_once("../inc/inc.ClassDbAuthentication.php");
 			$authobj = new SeedDMS_DbAuthentication($dms, $settings);
 			$user = $authobj->authenticate($login, $pwd);
 		} /* }}} */
 
 		/* If the user is still not authenticated, then exit with an error */
-		if(!$user) {
+		if(!is_object($user)) {
 			$this->callHook('loginFailed');
 			$this->setErrorMsg("login_error_text");
 			return false;
diff --git a/views/bootstrap/class.Search.php b/views/bootstrap/class.Search.php
index b29298654..47286b5ee 100644
--- a/views/bootstrap/class.Search.php
+++ b/views/bootstrap/class.Search.php
@@ -592,9 +592,8 @@ $(document).ready( function() {
 					else {
 						$document = $entry;
 						$owner = $document->getOwner();
-						$lc = $document->getLatestContent();
-						$version = $lc->getVersion();
-						$previewer->createPreview($lc);
+						if($lc = $document->getLatestContent())
+							$previewer->createPreview($lc);
 
 						if (in_array(3, $searchin))
 							$comment = $this->markQuery(htmlspecialchars($document->getComment()));
@@ -609,7 +608,7 @@ $(document).ready( function() {
 							$belowtitle .= htmlspecialchars($path[$i]->getName())."/";
 						}
 						$belowtitle .= "</span>";
-						$lcattributes = $lc->getAttributes();
+						$lcattributes = $lc ? $lc->getAttributes() : null;
 						$attrstr = '';
 						if($lcattributes) {
 							$attrstr .= "<table class=\"table table-condensed\">\n";
diff --git a/webdav/webdav.php b/webdav/webdav.php
index ff08f71ee..00c4e0d4f 100644
--- a/webdav/webdav.php
+++ b/webdav/webdav.php
@@ -1062,6 +1062,11 @@ class HTTP_WebDAV_Server_SeedDMS extends HTTP_WebDAV_Server
 		$objdest = $this->reverseLookup($options["dest"]);
 
 		$newdocname = '';
+		/* if the destіnation could not be found, then a folder/document shall
+		 * be renamed. In that case the source object is moved into the ѕame
+		 * or different folder under a new name.
+		 * $objdest will store the new destination folder afterwards
+		 */
 		if(!$objdest) {
 			/* check if at least the dest directory exists */
 			$dirname = dirname($options['dest']);
@@ -1112,13 +1117,17 @@ class HTTP_WebDAV_Server_SeedDMS extends HTTP_WebDAV_Server
 			/* Set the new Folder of the source object */
 			if(get_class($objsource) == $this->dms->getClassname('document')) {
 				/* Check if name already exists in the folder */
-				/*
 				if(!$settings->_enableDuplicateDocNames) {
-					if($objdest->hasDocumentByName($objsource->getName())) {
-						return "403 Forbidden";				 
+					if($newdocname) {
+						if($objdest->hasDocumentByName($newdocname)) {
+							return "403 Forbidden";				 
+						}
+					} else {
+						if($objdest->hasDocumentByName($objsource->getName())) {
+							return "403 Forbidden";				 
+						}
 					}
 				}
-				 */
 
 				$oldFolder = $objsource->getFolder();
 				if($objsource->setFolder($objdest)) {
@@ -1153,8 +1162,14 @@ class HTTP_WebDAV_Server_SeedDMS extends HTTP_WebDAV_Server
 			} elseif(get_class($objsource) == $this->dms->getClassname('folder')) {
 				/* Check if name already exists in the folder */
 				if(!$settings->_enableDuplicateSubFolderNames) {
-					if($objdest->hasSubFolderByName($objsource->getName())) {
-						return "403 Forbidden";				 
+					if($newdocname) {
+						if($objdest->hasSubFolderByName($newdocname)) {
+							return "403 Forbidden";				 
+						}
+					} else {
+						if($objdest->hasSubFolderByName($objsource->getName())) {
+							return "403 Forbidden";				 
+						}
 					}
 				}
 				$oldFolder = $objsource->getParent();
@@ -1176,7 +1191,7 @@ class HTTP_WebDAV_Server_SeedDMS extends HTTP_WebDAV_Server
 						$params['old_folder_path'] = $oldFolder->getFolderPathPlain();
 						$params['new_folder_path'] = $objdest->getFolderPathPlain();
 						$params['username'] = $this->user->getFullName();
-						$params['url'] = "http".((isset($_SERVER['HTTPS']) && (strcmp($_SERVER['HTTPS'],'off')!=0)) ? "s" : "")."://".$_SERVER['HTTP_HOST'].$settings->_httpRoot."out/out.ViewFolder.php?folderid=".$folder->getID();
+						$params['url'] = "http".((isset($_SERVER['HTTPS']) && (strcmp($_SERVER['HTTPS'],'off')!=0)) ? "s" : "")."://".$_SERVER['HTTP_HOST'].$settings->_httpRoot."out/out.ViewFolder.php?folderid=".$objsource->getID();
 						$params['sitename'] = $settings->_siteName;
 						$params['http_root'] = $settings->_httpRoot;
 						$this->notifier->toList($this->user, $nl["users"], $subject, $message, $params);