Index: filefield.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/filefield/filefield.module,v
retrieving revision 1.224
diff -u -p -r1.224 filefield.module
--- filefield.module	30 Jun 2010 01:37:29 -0000	1.224
+++ filefield.module	2 Dec 2010 19:25:02 -0000
@@ -556,7 +556,12 @@ function filefield_js($type_name, $field
   // Update the cached form with the new element at the right place in the form.
   if (module_exists('fieldgroup') && ($group_name = _fieldgroup_field_get_group($type_name, $field_name))) {
     if (isset($form['#multigroups']) && isset($form['#multigroups'][$group_name][$field_name])) {
-      $form_element = $form[$group_name][$delta][$field_name];
+      $tree = _fieldgroup_get_tree($type_name);
+      $parents = array(0 => $group_name);
+      while ($group_name = $tree[$group_name]['parents'][0]) {
+        $parents[] = $group_name;
+      }
+      eval('$form_element = $form["' . implode('"]["', array_reverse($parents)) . '"][$delta][$field_name];');
     }
     else {
       $form_element = $form[$group_name][$field_name][$delta];