Index: trunk/core/kernel/startup.php
===================================================================
diff -u -N -r5248 -r6428
--- trunk/core/kernel/startup.php	(.../startup.php)	(revision 5248)
+++ trunk/core/kernel/startup.php	(.../startup.php)	(revision 6428)
@@ -18,7 +18,7 @@
 
 	# New path detection method: begin
 	safeDefine('REL_PATH', '/admin');
-	$ps = preg_replace("/".preg_quote(rtrim(REL_PATH, '/'), '/')."$/", '', str_replace('\\', '/', dirname($_SERVER['PHP_SELF'])));
+	$ps = rtrim(preg_replace("/".preg_quote(rtrim(REL_PATH, '/'), '/')."$/", '', str_replace('\\', '/', dirname($_SERVER['PHP_SELF']))), '/');
 	safeDefine('BASE_PATH', $ps); // in case in-portal has defined it before
 	# New path detection method: end