Just got an update from vBulletin actually, you're currently under a temporary (possible permanent) suspension because your vbulletin license is not valid for the domain on your account. Should you choose to update it at vbulletin, let us know when that's complete, and we can unsuspend you after we re-verify it with vbulletin.
However, that is the -only- way to get unsuspended. If you choose not to update the license with vB, it's considered unlicensed and stays permanently suspended.
Let us know what you wish to do.