Index: typo3/init.php
===================================================================
--- typo3/init.php	(revision 6776)
+++ typo3/init.php	(working copy)
@@ -86,6 +86,12 @@
 define('PATH_thisScript',str_replace('//','/', str_replace('\\','/', (PHP_SAPI=='cgi'||PHP_SAPI=='isapi' ||PHP_SAPI=='cgi-fcgi')&&($_SERVER['ORIG_PATH_TRANSLATED']?$_SERVER['ORIG_PATH_TRANSLATED']:$_SERVER['PATH_TRANSLATED'])? ($_SERVER['ORIG_PATH_TRANSLATED']?$_SERVER['ORIG_PATH_TRANSLATED']:$_SERVER['PATH_TRANSLATED']):($_SERVER['ORIG_SCRIPT_FILENAME']?$_SERVER['ORIG_SCRIPT_FILENAME']:$_SERVER['SCRIPT_FILENAME']))));
 define('TYPO3_mainDir', 'typo3/');		// This is the directory of the backend administration for the sites of this TYPO3 installation.
 
+// *******************************
+// Fix BACK_PATH if necessary
+// *******************************
+if (isset($BACK_PATH) && TYPO3_mainDir != 'typo3/' && substr($BACK_PATH, -7) == '/typo3/') {
+	$BACK_PATH = substr($BACK_PATH, 0, -6) . TYPO3_mainDir;
+}
 
 // *******************************
 // Checking path