Well it seems a bug has hit my forum. Since I run 2.0 on a cvs version and usually test bug reports here for what ever reason, last night I hit a big bug.
Thankfully I was able to fix most of it, but you did lose theme specific setups. This bug has been logged in our team bug tracker with details to the developer about the bug.
At least it isn't as bad as the bug that caused the corruption to my board access on my main site :P It wouldn't let me fix it per group so I had to fix it per board and we have over 100 boards there.. wow..