--- template.php
+++ (clipboard)
@@ -143,8 +143,8 @@
   if (!user_access('administer comments')) {
     $vars['links'] = '';
   }
-  // if subjects in comments are turned off, don't show the title then
-  if (!variable_get('comment_subject_field', 1)) {
+  // If comment subjects are disabled, don't display them.
+  if (variable_get('comment_subject_field_' . $vars['node']->type, 1) == 0) {
     $vars['title'] = '';
   }
   // if user has no picture, add in a filler