I had this problem with a brand new set I purchased. Although I returned them before troubleshooting, many suggested that the Thrustmaster Drivers needed to be updated. This was not apparent on their website but someone posted a link to it.
I wish you guys would at least give us an approximate release on the throttle. I have my Gunfighter Pro on order and no throttle. As of today I have had my 3rd attempt at purchasing a warthog throttle go belly up with yet another new malfunctioning item straight from the box. Please don't make me buy the Virpil as I have been VKB since I first started.