2
You probable have exported newbb forums from some database and tried to upload it to another system. I've done it before, and had strange thing happened, such as yours.
I was messing around with the groups also, and received the same thing. Should leave it as it is. And I sugest to upgrade to 2.0.15, it's better!
...a person who enjoys exploring
the details of programmable systems
and how to stretch their capabilities,
as opposed to most users,
who prefer to learn only
the minimum necessary....