I have registered as a user a few minutes ago. My first attempt hadn't worked, there was a message (sadly I haven't saved it) that it could not be determined if the account was created and I should ensure that cookies are enabled. Cookies are always enabled.
I attempted a second time, and it worked flawlessly. The only difference was the password.
The working password is 40 characters long with upper and lower case and numbers.
The first password was shorter but contained special characters. As I don't use it and my passwords are random generated I can show it here (I hope it won't be mangled): ~-L-<p9L9VXV}~]HSB_"
Maybe there is a bug handling one or more of these special characters.