--- filefield/filefield.module	2010-12-12 15:37:11.000000000 -0800
+++ /var/www/pumainteractive.localhost/sites/all/modules/filefield/filefield.module	2011-04-17 22:25:20.000000000 -0700
@@ -620,10 +620,20 @@ 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];
+      $tree = _fieldgroup_get_tree($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)) . '"][$field_name][$delta];');
     }
   }
   else {