New system - Head tracking problems

[Yardstick]

Just built a new system and am having problems with head tracking (Trackhat clip and Opentrack).  On my previous systems, I've run the same set up and had no issues with CloD or other sims.  However, if I enable head tracking in CloD on this system the view spins violently about the horizonal axis and after a few seconds crashes the game.  IL-2 GB (the only other sim I've tested so far) works fine with the same set up.  With headtracking off, everything is as it should be.  Anyone have any suggestions.