I think it actually worked. I'm seeing your new user name everywhere. There was one issue where the new name wasn't immediately showing on your profile page, which it should have. That's been fixed.
If you saw anything else, it could have been due to caching:http://www.figurerealm.com/help.php#1-73
However, if you aren't seeing the correct name anywhere now, let me know. Give a link to the page if you can.