? sites/default/files
? sites/default/settings.php
Index: modules/user/user.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/user/user.pages.inc,v
retrieving revision 1.44
diff -u -p -r1.44 user.pages.inc
--- modules/user/user.pages.inc	30 Jun 2009 11:32:08 -0000	1.44
+++ modules/user/user.pages.inc	30 Jun 2009 23:26:41 -0000
@@ -139,6 +139,7 @@ function user_logout() {
   // Destroy the current session:
   session_destroy();
   module_invoke_all('user_logout', NULL, $user);
+  $_SESSION = array();
 
   // Load the anonymous user
   $user = drupal_anonymous_user();