Finally happened to us too a couple months back. So I disabled Guest access. However, a month later I found some 100X normal Guests - all from different places - all doing different things. Checking my referrers in cpanel led to one site that was using an ISP in South Korea. Since my forum is local, I just used cpanel to ban that entire block. I wont know for another month or two if that really solved the problem.
I guess what I'm saying is it isn't a chatbox issue. It may just be that when all these bots descend on a forum, they're getting caught in the chatbox.
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