Index: includes/common.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/common.inc,v
retrieving revision 1.615
diff -u -r1.615 common.inc
--- includes/common.inc	31 Jan 2007 15:49:22 -0000	1.615
+++ includes/common.inc	4 Feb 2007 18:06:04 -0000
@@ -349,8 +349,10 @@
     menu_set_active_item('');
   }
 
-  if (empty($return)) {
+  if (empty($return) || is_int($return)) {
     drupal_set_title(t('Page not found'));
+    menu_set_active_item('');
+    $return = t('The requested page could not be found.');
   }
   // To conserve CPU and bandwidth, omit the blocks
   print theme('page', $return, FALSE);
@@ -378,8 +380,9 @@
     menu_set_active_item('');
   }
 
-  if (empty($return)) {
+  if (empty($return) || is_int($return)) {
     drupal_set_title(t('Access denied'));
+    menu_set_active_item('');
     $return = t('You are not authorized to access this page.');
   }
   print theme('page', $return);