A couple of weeks back I disabled the signatures after we started getting signature spam from a few drive-by-spammers.
With the apparent low post count we have with this new forum software, spammers and hackers take notice. I think we should wait until the post count gets higher (discouraging the spammers) before some features are enabled.
Anyway, I'l go back in, look at the settings and see if I exclude code and spammy link stuff.