Hi Garry,
Sorry I didn't reply to your last posting - I haven't been on for a couple of days. Although I don't have Trackhat, I downloaded the Trackhat version of opentrack and it works! I'm looking at the Trackhat/Opentrack main screen and it's showing Protocol = freetrack 2.0 Enhanced and Profile = P3D.ini. I take it that you have enabled in Chase Plane under Preferences/General "experimental versions" and "auto-launch FSX/P3d" and "enable TrackIR" under Preferences/Camera? Get back and let me know if it works (fingers crossed, I know how frustrating it can be).