Sorry for the random change to Xenforo. It was not a planned update. We had some server problems and had to make some quick decisions on how to handle it. Since the amount of work to get vBulletin running again versus switching to Xenforo was about the same, we decided to take this route, as it was planned for the future, anyway.
I apologize for any problems that you are encountering, but we hope this is for the better.
– Xenforo has better reviews (and less security…
Forum Upgrade to Xenforo (from vBulletin)