Questions about membership
Where are you encountering this problem - when trying to join or after joining and trying to edit your profile?
To investigate fully we would need further information, such as what browser you are using, whether or not you have cookies enabled and on what part of creating the profile are you getting the error?
A test was just run and no anomolies were encountered and registration and profile creation went smoothly with no issues - suggest you clear browser cache and try again.
If problem continues please contact webmaster.