Posting here to verify that your username is above 16 characters and as Alpha stated too long. Usernames that go above that limit do not work properly. You have to make a new account next time you catch registration open. When you do be sure to follow the advice from the link Sagitta sent you in the above post. I apologize for the unfortunate news. Hope you'll be able to join us soon.
Locking this thread since the issue has been solved.