=== modified file 'ahah_helper.module'
--- ahah_helper.module	2010-01-18 13:35:31 +0000
+++ ahah_helper.module	2010-01-18 13:38:45 +0000
@@ -76,6 +76,15 @@
   // This is an AHAH-driven form, so enable caching.
   $form['#cache'] = TRUE;
 
+  // When not set.. try to remember the old action
+  if (!isset($form_state['storage']['old_action'])) {
+    $form_state['storage']['old_action'] = isset($form['#action']) ? $form['#action'] : $_SERVER['REQUEST_URI'];
+  }
+  // If the form action change, restore the old one.
+  if (isset($form_state['storage']['old_action']) && 
+      ($form['#action']!=$form_state['storage']['old_action'])) {
+    $form['#action'] = $form_state['storage']['old_action'];
+  }
   // Register the file.
   if (!isset($form_state['storage']['#ahah_helper']['file'])) {
     $menu_item = menu_get_item();