Index: includes/form.inc
===================================================================
RCS file: /cvs/drupal/drupal/includes/form.inc,v
retrieving revision 1.270
diff -u -r1.270 form.inc
--- includes/form.inc	14 Apr 2008 17:51:38 -0000	1.270
+++ includes/form.inc	21 Apr 2008 10:57:03 -0000
@@ -850,6 +850,7 @@
   }
 
   if (isset($form['#type']) && $form['#type'] == 'form') {
+    $cache = NULL;
     $complete_form = $form;
     if (!empty($form['#programmed'])) {
       $form_state['submitted'] = TRUE;
Index: modules/comment/comment.pages.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.pages.inc,v
retrieving revision 1.3
diff -u -r1.3 comment.pages.inc
--- modules/comment/comment.pages.inc	14 Apr 2008 17:48:36 -0000	1.3
+++ modules/comment/comment.pages.inc	21 Apr 2008 10:57:03 -0000
@@ -57,7 +57,7 @@
 
   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);
       }