diff -r 6c2ef083d89f -r fda73ac53450 src/cm/media/js/client/c_layout.js
--- a/src/cm/media/js/client/c_layout.js	Mon Mar 10 13:04:40 2014 +0100
+++ b/src/cm/media/js/client/c_layout.js	Mon Mar 10 13:24:19 2014 +0100
@@ -54,8 +54,8 @@
   },
   
   setLeftColumnWidth : function (colWidth) {
-    CY.get('#contentcolumn').setStyle('marginLeft', colWidth + 'px');
-    CY.get('#leftcolumn').setStyle('width', colWidth + 'px');
+    CY.one('#contentcolumn').setStyle('marginLeft', colWidth + 'px');
+    CY.one('#leftcolumn').setStyle('width', colWidth + 'px');
   },
   parentInterfaceUnfreeze : function() {
     if (this.isInFrame())