diff -r 52f3e090eed9 -r 0cead418e4cb src/cm/media/js/client/c_scopes.js
--- a/src/cm/media/js/client/c_scopes.js	Tue Mar 11 11:06:37 2014 +0100
+++ b/src/cm/media/js/client/c_scopes.js	Tue Mar 11 16:42:52 2014 +0100
@@ -462,7 +462,7 @@
           var nIds = getCommentIdsFromClasses(nElt) ; 
           quicksort(nIds) ;
           if (areSortedArraysEqual(cIds, nIds)) {
-            cElt.firstChild.setData(cElt.firstChild.getData() + nElt.firstChild.getData()); 
+            cElt.firstChild.data = cElt.firstChild.data + nElt.firstChild.data; 
             toBeRemovedElts.push(nElt) ;
           }
         }