--- sites/all/modules/hierarchical_select/hierarchical_select.module	2011-02-19 10:53:56.000000000 +0200
+++ sites/all/modules/hierarchical_select/hierarchical_select_original.module	2011-03-06 14:36:45.000000000 +0200
@@ -376,13 +376,15 @@ function _hs_process_shortcut_special_it
   return $special_items;
 }
 
-function _hs_process_attach_css_js($element, $hsid, $complete_form) {
+function _hs_process_attach_css_js($element, $hsid, $complete_form) { 
   // Set up Javascript and add settings specifically for the current
   // hierarchical select.
+  $element['#attached']['js'] = array('misc/ajax.js', 'misc/jquery.form.js'); 
   $element['#attached']['library'][] = array('system', 'effects.core');    
   $element['#attached']['library'][] = array('system', 'effects.drop');    
   $element['#attached']['css'][] = drupal_get_path('module', 'hierarchical_select') . '/hierarchical_select.css';
   $element['#attached']['js'][] = drupal_get_path('module', 'hierarchical_select') . '/hierarchical_select.js';
+  $element['#attached']['js'][] = drupal_get_path('module', 'hierarchical_select') . '/hierarchical_select_formtoarray.js'; 
   if (variable_get('hierarchical_select_js_cache_system', 0) == 1) {
     $element['#attached']['js'][] = drupal_get_path('module', 'hierarchical_select') . '/hierarchical_select_cache.js';
   }
@@ -706,7 +708,8 @@ function form_hierarchical_select_proces
   // Also make sure it is the *first* validate callback.
   $element['#element_validate'] = (isset($element['#element_validate'])) ? $element['#element_validate'] : array();
   $element['#element_validate'] = array_merge(array('_hierarchical_select_validate'), $element['#element_validate']);
+  $form_state['cache'] = TRUE; 
   //
   // Rendering.
   //