Index: pm_lite.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/pm_lite/pm_lite.module,v
retrieving revision 1.1.2.18
diff -u -p -r1.1.2.18 pm_lite.module
--- pm_lite.module	20 Feb 2009 05:43:36 -0000	1.1.2.18
+++ pm_lite.module	7 Jun 2009 03:07:32 -0000
@@ -341,7 +341,11 @@ function pm_lite_form(&$node) {
         }
 
         // Then set a default title.
-        $node->title = t('Re: @title', array('@title' => $parent->title));
+        if (strpos($parent->title, t('Re: @title', array('@title' => '')))) {
+          $node->title = t('Re: @title', array('@title' => $parent->title));
+        } else {
+          $node->title = $parent->title;
+        }
 
         // Finally, set the parent node ID for the reply.
         $form['parent'] = array(