http://www.vbulletin.com/forum/forum...k-or-ban-an-ip

Try that. Been a while since I've messed with vBulletin- I use SMF on my own sites now. What about doing some 'human interaction test' to require an intelligent response to a question while registering. not just the little graphic "what is this word" crap that nobody can read- I hate those.
something like the prod site or another similar thing that requires a very small amount of common sense to enter the answer.