- Patch #216515 by chx, Damien Tournoud, et al: fixed form API glitch with caching.

includes/form.inc

@@ -852,6 +852,7 @@ function form_builder($form_id, $form, &$form_state) {
   }
 
   if (isset($form['#type']) && $form['#type'] == 'form') {
+    $cache = NULL;
     $complete_form = $form;
     if (!empty($form['#programmed'])) {
       $form_state['submitted'] = TRUE;

modules/comment/comment.pages.inc

@@ -56,7 +56,7 @@ function comment_reply($node, $pid = NULL) {
 
   if (user_access('access comments')) {
     // The user is previewing a comment prior to submitting it.
-    if ($op == t('Preview comment')) {
+    if ($op == t('Preview')) {
       if (user_access('post comments')) {
         $output .= comment_form_box(array('pid' => $pid, 'nid' => $node->nid), NULL);
       }