? includes/menu.inc.next
Index: modules/menu/menu.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/menu/menu.module,v
retrieving revision 1.157.2.3
diff -u -p -r1.157.2.3 menu.module
--- modules/menu/menu.module	10 May 2008 06:53:53 -0000	1.157.2.3
+++ modules/menu/menu.module	10 Feb 2009 01:17:01 -0000
@@ -254,8 +254,7 @@ function _menu_parents_recurse($tree, $m
  * Reset a system-defined menu item.
  */
 function menu_reset_item($item) {
-  $router = menu_router_build();
-  $new_item = _menu_link_build($router[$item['router_path']]);
+  $new_item = _menu_link_build(menu_get_item($item['router_path']));
   foreach (array('mlid', 'has_children') as $key) {
     $new_item[$key] = $item[$key];
   }
Index: modules/system/system.install
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.install,v
retrieving revision 1.238.2.8
diff -u -p -r1.238.2.8 system.install
--- modules/system/system.install	14 Jan 2009 21:36:16 -0000	1.238.2.8
+++ modules/system/system.install	10 Feb 2009 01:17:01 -0000
@@ -2532,6 +2532,13 @@ function system_update_6048() {
   return $ret;
 }
 
+/**
+ * Clear any router blobs stored in the cache table.
+ */
+function system_update_6049() {
+  cache_clear_all('router:', 'cache_menu', TRUE);
+  return array();
+}
 
 /**
  * @} End of "defgroup updates-5.x-to-6.x"