@fitnessblogger and @4ella with out additional information on your configuration its hard for me to say what the issue is. The above code was written specifically to resolve the issue on one of my websites and its working perfectly there as provided above.
Now that said its worth noting the site the code is being used on is running
WordPress 3.6-beta3-24450. @4ella you mentioned you running the latest version of wordpress which if not the beta is 3.5.2 which 3.6 has some pretty major changes made to it so this could be part of the problem.
