Index: panels.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/panels/panels.module,v
retrieving revision 1.28.2.43
diff -u -p -r1.28.2.43 panels.module
--- panels.module       13 Oct 2009 21:47:58 -0000      1.28.2.43
+++ panels.module       20 Oct 2009 15:02:30 -0000
@@ -1017,7 +1017,7 @@ function template_preprocess_panels_pane
       $vars['id'] = ' id="' . $content->css_id . '"';
     }
     if (!empty($content->css_class)) {
-      $vars['classes'] = ' ' . $content->css_class;
+      $vars['classes'] .= ' ' . $content->css_class;
     }
   }