Before doing the upgrade to Beta 4. I have one forum called "News Information" and I have changed permission for the "Members User-group" to not start new threads. That was the only user-group altered and one permission changed only to "Revoke". But I've just spotted as "Admin" I cannot post on that forum anymore like before, it says I don't have sufficient privileges. So I went and removed custom permission for "Members User-group" so all was default (nothing changed). As Admin I could then post on that forum, but when going back into permission and changing "Member User-group" to revoke starting new threads. It's also effected me as Admin not being able to start new threads also. But I have not touched admin permissions.