I just tried to create an account myself, and unless the email takes a while, it never worked.
Account name - don't know if this actively checks for existing account names, but got green tick every time.
Password - comparison check is ok, green tick
Secret question - seems fine, green tick
Secret answer - you can get a green tick by entering the question, and with 1 word. (might be worth some explain text on entry)
Date of Birth - maybe I'm too old !! - you do get a green tick after it complains and you fully enter it.
Email - is this checked for existing accounts ? to avoid people making lots of accounts ? I don't currently have an account (I had one when the server started), as the login says it doesn't exist, but my email could be in a db somewhere. Get a green tick tho.
Tried just ticking the terms and ticking terms and spam.
Clicking SUBMIT after typing in the captcha always gives Account creation failed. Hitting enter after typing the captcha clears all the entries after the site thinks about it - could this be the point you wait for an email ?