diff --git a/plugins/calendar/calendar.php b/plugins/calendar/calendar.php
index e7ecd2ec..35df4684 100644
--- a/plugins/calendar/calendar.php
+++ b/plugins/calendar/calendar.php
@@ -1149,6 +1149,7 @@ class calendar extends rcube_plugin
     return array(
       'start' => gmdate('c', $this->fromGMT($event['start'])), // client treats date strings as they were in users's timezone
       'end'   => gmdate('c', $this->fromGMT($event['end'])),   // so shift timestamps to users's timezone and render a date string
+      'title'       => strval($event['title']),
       'description' => strval($event['description']),
       'location'    => strval($event['location']),
       'className'   => ($addcss ? 'fc-event-cal-'.asciiwords($event['calendar'], true).' ' : '') . 'fc-event-cat-' . asciiwords(strtolower($event['categories']), true),
diff --git a/plugins/libkolab/lib/kolab_format.php b/plugins/libkolab/lib/kolab_format.php
index a7b1e487..b7ce0578 100644
--- a/plugins/libkolab/lib/kolab_format.php
+++ b/plugins/libkolab/lib/kolab_format.php
@@ -29,6 +29,11 @@ abstract class kolab_format
 {
     public static $timezone;
 
+    public /*abstract*/ $CTYPE;
+
+    protected /*abstract*/ $read_func;
+    protected /*abstract*/ $write_func;
+
     protected $obj;
     protected $data;
     protected $xmldata;
@@ -232,7 +237,29 @@ abstract class kolab_format
      *
      * @param string XML data
      */
-    abstract public function load($xml);
+    public function load($xml)
+    {
+        $this->obj = call_user_func($this->read_func, $xml, false);
+        $this->loaded = !$this->format_errors();
+    }
+
+    /**
+     * Write object data to XML format
+     *
+     * @return string XML data
+     */
+    public function write()
+    {
+        $this->init();
+        $this->xmldata = call_user_func($this->write_func, $this->obj);
+
+        if (!$this->format_errors())
+            $this->update_uid();
+        else
+            $this->xmldata = null;
+
+        return $this->xmldata;
+    }
 
     /**
      * Set properties to the kolabformat object
@@ -246,13 +273,6 @@ abstract class kolab_format
      */
     abstract public function is_valid();
 
-    /**
-     * Write object data to XML format
-     *
-     * @return string XML data
-     */
-    abstract public function write();
-
     /**
      * Convert the Kolab object into a hash array data structure
      *
diff --git a/plugins/libkolab/lib/kolab_format_contact.php b/plugins/libkolab/lib/kolab_format_contact.php
index d6da2352..d39b32e0 100644
--- a/plugins/libkolab/lib/kolab_format_contact.php
+++ b/plugins/libkolab/lib/kolab_format_contact.php
@@ -26,6 +26,9 @@ class kolab_format_contact extends kolab_format
 {
     public $CTYPE = 'application/vcard+xml';
 
+    protected $read_func = 'kolabformat::readContact';
+    protected $write_func = 'kolabformat::writeContact';
+
     public static $fulltext_cols = array('name', 'firstname', 'surname', 'middlename', 'email');
 
     public $phonetypes = array(
@@ -113,35 +116,6 @@ class kolab_format_contact extends kolab_format
         $this->phonetypes['workfax'] |= Telephone::Work;
     }
 
-    /**
-     * Load Contact object data from the given XML block
-     *
-     * @param string XML data
-     */
-    public function load($xml)
-    {
-        $this->obj = kolabformat::readContact($xml, false);
-        $this->loaded = true;
-    }
-
-    /**
-     * Write Contact object data to XML format
-     *
-     * @return string XML data
-     */
-    public function write()
-    {
-        $this->init();
-        $this->xmldata = kolabformat::writeContact($this->obj);
-
-        if (!parent::format_errors())
-            parent::update_uid();
-        else
-            $this->xmldata = null;
-
-        return $this->xmldata;
-    }
-
     /**
      * Set contact properties to the kolabformat object
      *
diff --git a/plugins/libkolab/lib/kolab_format_distributionlist.php b/plugins/libkolab/lib/kolab_format_distributionlist.php
index 592387e2..3931c61d 100644
--- a/plugins/libkolab/lib/kolab_format_distributionlist.php
+++ b/plugins/libkolab/lib/kolab_format_distributionlist.php
@@ -26,6 +26,10 @@ class kolab_format_distributionlist extends kolab_format
 {
     public $CTYPE = 'application/vcard+xml';
 
+    protected $read_func = 'kolabformat::readDistlist';
+    protected $write_func = 'kolabformat::writeDistlist';
+
+
     function __construct($xmldata = null)
     {
         $this->obj = new DistList;
@@ -33,34 +37,10 @@ class kolab_format_distributionlist extends kolab_format
     }
 
     /**
-     * Load Kolab object data from the given XML block
+     * Set properties to the kolabformat object
      *
-     * @param string XML data
+     * @param array  Object data as hash array
      */
-    public function load($xml)
-    {
-        $this->obj = kolabformat::readDistlist($xml, false);
-        $this->loaded = true;
-    }
-
-    /**
-     * Write object data to XML format
-     *
-     * @return string XML data
-     */
-    public function write()
-    {
-        $this->init();
-        $this->xmldata = kolabformat::writeDistlist($this->obj);
-
-        if (!parent::format_errors())
-            parent::update_uid();
-        else
-            $this->xmldata = null;
-
-        return $this->xmldata;
-    }
-
     public function set(&$object)
     {
         $this->init();
@@ -137,7 +117,7 @@ class kolab_format_distributionlist extends kolab_format
         // read object properties
         $object = array(
             'uid'       => $this->obj->uid(),
-#           'changed'   => $this->obj->lastModified(),
+            'changed'   => $this->obj->lastModified(),
             'name'      => $this->obj->name(),
             'member'    => array(),
         );
diff --git a/plugins/libkolab/lib/kolab_format_event.php b/plugins/libkolab/lib/kolab_format_event.php
index 699cfb81..aec4e8d1 100644
--- a/plugins/libkolab/lib/kolab_format_event.php
+++ b/plugins/libkolab/lib/kolab_format_event.php
@@ -26,6 +26,9 @@ class kolab_format_event extends kolab_format
 {
     public $CTYPE = 'application/calendar+xml';
 
+    protected $read_func = 'kolabformat::readEvent';
+    protected $write_func = 'kolabformat::writeEvent';
+
     public static $fulltext_cols = array('title', 'description', 'location', 'attendees:name', 'attendees:email');
 
     private $sensitivity_map = array(
@@ -99,35 +102,6 @@ class kolab_format_event extends kolab_format
         $this->xmldata = $xmldata;
     }
 
-    /**
-     * Load Contact object data from the given XML block
-     *
-     * @param string XML data
-     */
-    public function load($xml)
-    {
-        $this->obj = kolabformat::readEvent($xml, false);
-        $this->loaded = true;
-    }
-
-    /**
-     * Write Contact object data to XML format
-     *
-     * @return string XML data
-     */
-    public function write()
-    {
-        $this->init();
-        $this->xmldata = kolabformat::writeEvent($this->obj);
-
-        if (!parent::format_errors())
-            parent::update_uid();
-        else
-            $this->xmldata = null;
-
-        return $this->xmldata;
-    }
-
     /**
      * Set contact properties to the kolabformat object
      *
diff --git a/plugins/libkolab/lib/kolab_storage_cache.php b/plugins/libkolab/lib/kolab_storage_cache.php
index be94bb87..370eac1e 100644
--- a/plugins/libkolab/lib/kolab_storage_cache.php
+++ b/plugins/libkolab/lib/kolab_storage_cache.php
@@ -506,6 +506,12 @@ class kolab_storage_cache
             'lock'
         ));
 
+        // abort if database is not set-up
+        if ($this->db->is_error()) {
+            $this->ready = false;
+            return;
+        }
+
         // create lock record if not exists
         if (!$sql_arr) {
             $this->db->query(
@@ -538,6 +544,9 @@ class kolab_storage_cache
      */
     private function _sync_unlock()
     {
+        if (!$this->ready)
+            return;
+
         $this->db->query(
             "UPDATE kolab_cache SET msguid=0, created='' ".
             "WHERE resource=? AND type=?",