diff --git a/addressbook/inc/class.addressbook_bo.inc.php b/addressbook/inc/class.addressbook_bo.inc.php
index 1de9ef6413..6d5604c3ba 100755
--- a/addressbook/inc/class.addressbook_bo.inc.php
+++ b/addressbook/inc/class.addressbook_bo.inc.php
@@ -1776,6 +1776,13 @@ class addressbook_bo extends addressbook_so
 		return $success;
 	}
 
+	/**
+	 * Some caching for lists within request
+	 *
+	 * @var array
+	 */
+	private static $list_cache = array();
+
 	/**
 	 * Check if user has required rights for a list or list-owner
 	 *
@@ -1807,7 +1814,15 @@ class addressbook_bo extends addressbook_so
 	{
 		if (!$this->check_list(null,EGW_ACL_ADD|EGW_ACL_EDIT,$owner)) return false;
 
-		return parent::add_list($keys,$owner,$contacts,$data);
+		try {
+			$ret = parent::add_list($keys,$owner,$contacts,$data);
+			if ($ret) unset(self::$list_cache[$ret]);
+		}
+		// catch sql error, as creating same name&owner list gives a sql error doublicate key
+		catch(egw_exception_db $e) {
+			return false;
+		}
+		return $ret;
 	}
 
 	/**
@@ -1822,6 +1837,8 @@ class addressbook_bo extends addressbook_so
 	{
 		if (!$this->check_list($list,EGW_ACL_EDIT)) return false;
 
+		unset(self::$list_cache[$list]);
+
 		return parent::add2list($contact,$list,$existing);
 	}
 
@@ -1836,6 +1853,15 @@ class addressbook_bo extends addressbook_so
 	{
 		if ($list && !$this->check_list($list,EGW_ACL_EDIT)) return false;
 
+		if ($list)
+		{
+			unset(self::$list_cache[$list]);
+		}
+		else
+		{
+			self::$list_cache = array();
+		}
+
 		return parent::remove_from_list($contact,$list);
 	}
 
@@ -1849,6 +1875,11 @@ class addressbook_bo extends addressbook_so
 	{
 		if (!$this->check_list($list,EGW_ACL_DELETE)) return false;
 
+		foreach((array)$list as $l)
+		{
+			unset(self::$list_cache[$l]);
+		}
+
 		return parent::delete_list($list);
 	}
 
@@ -1860,11 +1891,9 @@ class addressbook_bo extends addressbook_so
 	 */
 	function read_list($list)
 	{
-		static $cache;
+		if (isset(self::$list_cache[$list])) return self::$list_cache[$list];
 
-		if (isset($cache[$list])) return $cache[$list];
-
-		return $cache[$list] = parent::read_list($list);
+		return self::$list_cache[$list] = parent::read_list($list);
 	}
 
 	/**
diff --git a/addressbook/inc/class.addressbook_groupdav.inc.php b/addressbook/inc/class.addressbook_groupdav.inc.php
index e560c4bc24..e47bf85813 100644
--- a/addressbook/inc/class.addressbook_groupdav.inc.php
+++ b/addressbook/inc/class.addressbook_groupdav.inc.php
@@ -243,7 +243,7 @@ class addressbook_groupdav extends groupdav_handler
 			}
 		}
 		// add groups after contacts, but only if enabled and NOT for '/addressbook/' (!isset($filter['owner'])
-		if (in_array('D',$this->home_set_pref) && (!$start || count($contacts) < $start[1]) && isset($filter['owner']))
+		if (in_array('D',$this->home_set_pref) && (!$start || count($contacts) < $start[1]))
 		{
 			$where = array(
 				'list_owner' => isset($filter['owner'])?$filter['owner']:array_keys($this->bo->grants)
@@ -284,9 +284,9 @@ class addressbook_groupdav extends groupdav_handler
 					}
 					$files[] = $this->add_resource($path, $list, $props);
 
-					if ($sync_collection_report && $this->sync_collection_token < $list['list_modified'])
+					if ($sync_collection_report && $this->sync_collection_token < ($ts=$GLOBALS['egw']->db->from_timestamp($list['list_modified'])))
 					{
-						$this->sync_collection_token = $list['list_modified'];
+						$this->sync_collection_token = $ts;
 					}
 				}
 			}
@@ -626,17 +626,8 @@ class addressbook_groupdav extends groupdav_handler
 
 		if (!isset($contact['etag']))
 		{
-			if ($is_group)
-			{
-				if (($contact = $this->bo->read_list($save_ok)))
-				{
-					$contact = egw_db::strip_array_keys($contact, 'list_');
-				}
-			}
-			else
-			{
-				$contact = $this->bo->read($save_ok);
-			}
+			// epl-11.1 does not store carddav_name for lists, so we need to generate it here
+			$contact = $this->read($is_group ? common::generate_uid('addressbook-lists', $save_ok) : $contact['carddav_name'], $options['path']);
 			//error_log(__METHOD__."(, $id, '$user') read(_list)($save_ok) returned ".array2string($contact));
 		}
 
@@ -661,7 +652,7 @@ class addressbook_groupdav extends groupdav_handler
 		if (!isset($contact['owner'])) $contact['owner'] = $GLOBALS['egw_info']['user']['account_id'];
 		foreach(array('id','carddav_name','uid','owner') as $name)
 		{
-			if ($name != self::$path_attr) $data['list_'.$name] = $contact[$name];
+			$data['list_'.$name] = $contact[$name];
 		}
 		//error_log(__METHOD__.'('.array2string($contact).', '.array2string($oldContact).') data='.array2string($data));
 		if (($list_id=$this->bo->add_list(array('list_'.self::$path_attr => $contact[self::$path_attr]),
@@ -711,10 +702,11 @@ class addressbook_groupdav extends groupdav_handler
 				if ($to_add_ids) $this->bo->add2list($to_add_ids, $list_id, array());
 				if ($to_delete_ids) $this->bo->remove_from_list($to_delete_ids, $list_id);
 			}
+			// reread as update of list-members updates etag and modified
+	 		$contact = $this->bo->read_list($list_id);
 		}
 		if ($this->debug > 1) error_log(__METHOD__.'('.array2string($contact).', '.array2string($oldContact).') on return contact='.array2string($data).' returning '.array2string($list_id));
- 		$contact = $data;
-		return $list_id;
+ 		return $list_id;
 	}
 
 	/**
@@ -739,8 +731,8 @@ class addressbook_groupdav extends groupdav_handler
 			$user = array_merge((array)$user,array_keys($this->get_shared(true)));	// true: ignore all-in-one pref
 		}
 		$ctag = $this->bo->get_ctag($user);
-		// include lists-ctag, if enabled and NOT in /addressbook/ (we dont sync distribution-lists/groups there)
-		if (in_array('D',$this->home_set_pref) && $path != '/addressbook/')
+		// include lists-ctag, if enabled
+		if (in_array('D',$this->home_set_pref))
 		{
 			$lists_ctag = $this->bo->lists_ctag($user);
 		}