Index: hierarchical_select.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/hierarchical_select/hierarchical_select.module,v
retrieving revision 1.190
diff -u -F '^f' -r1.190 hierarchical_select.module
--- hierarchical_select.module	25 Aug 2010 19:57:23 -0000	1.190
+++ hierarchical_select.module	25 Aug 2010 22:26:51 -0000
@@ -300,6 +300,9 @@ function hierarchical_select_json() {
   // Collect all necessary variables.
   $cached = cache_get($hs_form_build_id, 'cache_hierarchical_select');
   $storage = $cached->data;
+  if (!$storage) {
+    $storage = $_SESSION['hierarchical_select_js'];
+  }
 
   // Ensure that the form id in the POST array is the same as the one of the
   // stored parameters of the original form. For 99% of the forms, this step
@@ -740,6 +743,7 @@ function hierarchical_select_after_build
     // render part of the form).
     $hs_form_build_id = 'hs_form_'. md5(mt_rand());
     cache_set($hs_form_build_id, $storage, 'cache_hierarchical_select', time() + $expire);
+    $_SESSION['hierarchical_select_js'] = $storage;
   }
   elseif (isset($_POST['hs_form_build_id'])) {
     // Don't generate a new hs_form_build_id if this is a re-rendering of the