Index: branches/5.1.x/core/units/user_groups/user_groups_eh.php
===================================================================
diff -u -r13086 -r14135
--- branches/5.1.x/core/units/user_groups/user_groups_eh.php	(.../user_groups_eh.php)	(revision 13086)
+++ branches/5.1.x/core/units/user_groups/user_groups_eh.php	(.../user_groups_eh.php)	(revision 14135)
@@ -1,6 +1,6 @@
 <?php
 /**
-* @version	$Id: user_groups_eh.php 13086 2010-01-12 19:47:40Z alex $
+* @version	$Id: user_groups_eh.php 14135 2011-01-09 14:51:45Z alex $
 * @package	In-Portal
 * @copyright	Copyright (C) 1997 - 2009 Intechnic. All rights reserved.
 * @license      GNU/GPL
@@ -80,7 +80,7 @@
 				}
 			}
 
-			$this->Application->StoreVar($this->Application->GetTopmostPrefix($event->Prefix).'_modified', '1');
+			$this->Application->StoreVar($this->Application->GetTopmostPrefix($event->Prefix).'_modified', '1', true); // true for optional
 			$event->SetRedirectParam('opener', 'u');
 		}