We've seen this around, and the link you initially reference refers to a security bug in the phpBB bulletin board system (which we don't use). I'm fairly confident in the security measures in place with our ZeroForum software but I'll definitely inquire with the system admins further. Thanks.
I've "tested" the site using Google a few times in the past. While profile information is visible through the engine, there is nothing that is not otherwise publicly available by coming to the site and viewing a profile.