This product uses the "is_member_of()" function when it comes to usergroups...and so no matter how many usergroups to which a user belongs, if he/she is a member of any usergroup which you select, then the BBCodes you set will be disabled for them. I don't see this as a "problem," because that's the way I intended this product to work. I can add the option to only have primary usergroups used though..
I will also look into allowing the specification of BBCodes that are by default disabled except for users/usergroups you set.