1. Go to http://forums.manadeprived.com
2. Choose to Login with Facebook
3. Once you have agreed to let the app access your Facebook...
4. You are brought back to the forum where you are then asked to create a new account for the forum itself.
After submitting, the following message:
"A server error occurred. Please try again later." is shown. However, the new user is actually created, although with no password being given, I cannot login with it.