Almost everytime i use TIR4 within FSX, i encounter some small to large problems.
Most frequent is the problem where i'm not able to look down anymore. The moment i look down to the instruments, the view starts to wobble (can't explain it otherwise) left and right and i'm not able to look even more down (which should be possible). Disabeling and re-enabling of TIR during the game does not help. I need to shut the game down and restart it to cure the problem which mostly occurs again after a while. I first thought that the tracker lost sight of the reflections but this is not the case when i run some tests in either heads-view mode or in any other game.
Also in FSX, the view gets stuck in total look down view (ie looking directly to into your own seat). The only option out of this is resetting the TIR's view. Happens now and then.
Next thing i've encountered (only 2x so far) is that the TIR starts to lag behind my won head movement. This is also something which i'm not able to reproduce outside the game (although i had the same thing once in GTR and once in Lock-On).
FSX: Look down view goes bananas
Re: FSX: Look down view goes bananas
We are currently working on the issue, among several others, and hope to have more information posted soon.