Hi,
We have been getting clobbered with forum spam lately, and have had to disable some features.
The forum spammer's goal is to write links in the forum that point to some site or other.
So we have turned off bbcode in all forums, which disallows links in forum posts.
We have also turned off signatures for free users, which disallows links in signatures. We left signatures on for non-free users. All forum spammers are free users.
We hope to come up with a better solution shortly, but this should give us the maximum usefulness and hopefully discourage future spam.
Sorry about the incovenience, I know people love their sigs :)
Jon