--- modules/system/system.module.patch  2008-08-29 10:00:09.000000000 -0700
+++ modules/system/system.module        2008-08-29 10:55:51.000000000 -0700
@@ -918,6 +918,10 @@ function _system_theme_data() {
           $themes[$key]->prefix = $key;
         }
       }
+      // Add in base regions
+      foreach ($themes[$base_key]->info['regions'] as $region_name => $region_title) {
+        $themes[$key]->info['regions'][$region_name] = $region_title;
+      }
     }
 
     $themes_info = $themes;