diff -r cbe216651b19 -r 5eeed336b992 src/cm/media/js/client/c_db.js
--- a/src/cm/media/js/client/c_db.js	Mon Aug 05 04:05:28 2013 +0200
+++ b/src/cm/media/js/client/c_db.js	Wed Sep 04 22:11:01 2013 +0200
@@ -477,7 +477,7 @@
   filterByCat : function(cat, cWithCatIds, rWithCatIds) {
     for (var id in this.allCommentsByDbId) {
       var comment = this.allCommentsByDbId[id] ;
-      if (cat == "" || comment.category == cat) { 
+      if (cat == undefined || cat == "" || comment.category == cat) { 
         if (comment.reply_to_id == null) {
           cWithCatIds.push(comment.id);
           if (comment.replies.length) {