Hey,
Had a similar problem, which was related to using Trackir in combination with the use of a Saitek stick (x52 pro). The programming software and button-use, conflicted with Trackir.
Couldn’t find a clear solution, so kicked out the Saitekprogramming. Problem solved. Unelegantly, I admit. 😉
About Trackir, its know that using TIR on an USB powerhub causes problems. It needs a direct USB port. Info from the Trackir site/Naturalpoint.
Hope you can fix the problem.
2DIZZY