Sorry, this was the first that I've heard about trouble with registration. I've opened up guest posting, but it was originally restricted because we were getting an unreasonable amount of spammers on the old system.
Anyway, if you could give me some more details regarding the trouble that you had in registration, I'll look into it more. Thanks.
By the way, st5150, I've updated your post count here to reflect the number of posts that you had on the old forum. Welcome back.