Yes, the forums were mostly empty, as I hadn't opened the board to the public yet. I was posting messages (the first ones) in there tonight and that's when I got the error message.
As far as I know I did the upgrade correctly, except I rebuilt the forum stat files before I rebuilt the member files... <img src="https://www.ubbcentral.com/boards/images/graemlins/blush.gif" alt="" /> That's the only thing I did that is out of whack. Is that it? Do I have to install the whole thing again?