Index: includes/module.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/module.inc,v
retrieving revision 1.192
diff -u -p -r1.192 module.inc
--- includes/module.inc	9 May 2010 13:49:33 -0000	1.192
+++ includes/module.inc	20 Jun 2010 23:17:15 -0000
@@ -173,6 +173,7 @@ function system_list($type) {
  */
 function system_list_reset() {
   drupal_static_reset('system_list');
+  drupal_static_reset('list_themes');
   cache_clear_all('bootstrap_modules', 'cache_bootstrap');
   cache_clear_all('system_list', 'cache_bootstrap');
 }