Index: modules/system/system.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/system/system.module,v
retrieving revision 1.797
diff -u -p -r1.797 system.module
--- modules/system/system.module	29 Sep 2009 15:31:16 -0000	1.797
+++ modules/system/system.module	30 Sep 2009 05:04:58 -0000
@@ -2136,7 +2136,8 @@ function system_region_list($theme_key, 
   $list = &drupal_static(__FUNCTION__, array());
 
   if (empty($list[$theme_key][$show])) {
-    $info = unserialize(db_query("SELECT info FROM {system} WHERE type = :type AND name = :name", array(':type' => 'theme', ':name' => $theme_key))->fetchField());
+    $themes = list_themes();
+    $info = $themes[$theme_key]->info;
     // If requested, suppress hidden regions. @see block_admin_display_form().
     foreach ($info['regions'] as $name => $label) {
       if ($show == REGIONS_ALL || !isset($info['regions_hidden']) || !in_array($name, $info['regions_hidden'])) {