--- class.t3lib_userauthgroup-orig.php	2008-06-19 14:58:36.000000000 +0200
+++ class.t3lib_userauthgroup.php	2008-06-19 14:58:18.000000000 +0200
@@ -1461,6 +1461,12 @@
 				break;
 			}
 		}
+		
+		
+		// return false for default workspac if disabled in localconf.php
+		if($GLOBALS['TYPO3_CONF_VARS']['BE']['disableDefaultWorkspace'] && $wsRec['uid'] == -1){
+			return false;
+		}
 
 			// If wsRec is set to an array, evaluate it:
 		if (is_array($wsRec))	{