Hi
Sorry, I have been away and busy for a few weeks - I have to post some news ..
Well, there is something in the Bugreport I see, and I know of the bug. Generally,there is a bug in the function which checks, if a user already has a seat. It checks for all seats, rather than just whether the user already has a seat for the same event. So if you start a second event with a new seatmap and do not delete the first seatmap (which you should not have to do), all users will get a message that they already occupy a seat. It's just a matter of adding a "WHERE eventid=x" somewhere...
Might this be the problem in your case or am I getting this wrongly?