It sounds like the conversion issue
Nikmal describes in this post. To fix it, you had to install 205 and revert to your automatically backed-up database from version 200 so the newer version could redo the conversion without messing up your statblocks. The procedure is described in the Release Notes for version 204.
Unfortunately, if this is it you may have to choose between getting back your statblock data or keeping the work you've been doing in the meantime. :(
If that's not it, then make sure you
report the bug you're having.
If you haven't updated your second computer past version 200, then you shouldn't have any problems looking at anything it already has on it. You won't be able to sync, but that's OK for now. Just don't install 205 on it.
If it has been updated with 201-205, then my guess is that it will have the same problems as your main computer. You could work your way back to 200 and your database from before the conversion (temporarily) or just wait it out.
Good luck. :(