They had a problem in the past where some IP ranges couldn't sign up (but could access the site once they had an account), and got a response saying the site was full. Staff said there was no IP ban in effect, and they had no idea what the problem was.
The staff member I talked to suggested I should try to sign up through a proxy, or get someone else from a different range to sign up for me. The latter worked for me.
Good luck, it is a great tracker and well worth the effort to sign up.
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