If TrackIR is working fine on the TrackIR software and it only fails to connect to P3D, you can try resetting the SimConnect library which is used to communicate with the TrackIR server. Check if the files are included in the following installation directory. They are located in these folders:
\Lockheed Martin\Prepar3D v4\redist\Interface\FSX-SP1\retail\lib
\Lockheed Martin\Prepar3D v4\redist\Interface\FSX-SP2-XPACK\retail\lib
If they already exist, try running the included MSI files to reset them. Once you have done that, reboot the computer, and then run TrackIR as administrator, and then run the game with administrator privileges as well.
https://www.avsim.com/forums/topic/5731 ... v5/page/3/
http://www.prepar3d.com/forum/viewtopic ... 15#p125445
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