I trust now that this problem is out in the open (see the forzamotorsport.net forums), anyone using it in a league race will be banned outright?
this and the glitch that happened to me lastnight where my gears were ultra tall for no reason need to be fixed ASAP, or they will ruin the game.
This glitch involves doing something to make any car act like an AWD. Check out the telemetry on the top time on Class-A Tsukuba (with his anti-glitch paintjob, heh.) He turned a 1000+ HP Barracuda into an AWD.