commit 7f0816b9ac39f884007ff4c215bb2e13bd8de3c9
Author: Jen Lampton <jen@jeneration.com>
Date:   Tue Jul 16 17:13:52 2013 -0700

    trying again

diff --git a/core/includes/common.inc b/core/includes/common.inc
index 673593f..e8e02d7 100644
--- a/core/includes/common.inc
+++ b/core/includes/common.inc
@@ -3843,15 +3843,14 @@ function drupal_render(&$elements) {
       // element attributes in the format #wrapper_wrappername_attributename to
       // override #attributename.
       $wrapper_elements = $elements;
-      foreach($wrapper_elements as $key => $value) {
-        if ($key[0] === '#') {
-          $override_key = '#wrapper_' . $theme_wrapper . '_' . substr($key, 1);
-          if (isset($wrapper_elements[$override_key])) {
-            $wrapper_elements[$key] = $wrapper_elements[$override_key];
-          }
+      foreach ($wrapper_elements as $key => $value) {
+        if (strstr($key, '#wrapper_' . $theme_wrapper . '_')) {
+          $strlen = strlen('#wrapper_' . $theme_wrapper . '_');
+          $new_key = '#' . substr($key, $strlen);
+          $wrapper_elements[$new_key] = $wrapper_elements[$key];
+          unset($wrapper_elements[$key]);
         }
       }
-
       $elements['#children'] = theme($theme_wrapper, $wrapper_elements);
     }
   }