I've been using my TrackIR3 with Vector expansion for several years now with great success and lots of fun in FS2004, running on Win XP.
For a while now I do however have a problem with the yaw axis apparently not responding in a symetrical way anymore to my head's inputs.
So to explain myself a bit better I took some screenshots to illustrate the problem:
1) View centered to 12h
To start here just as it should be: sitting straight in front of the sensor, looking straight ahead...

2) Looking right to 1h
I tried to align the upper and lower reflections so, that they're directly on top of each other.
This gives me a view of maybe 1h, 2h out of the cockpit.

3) Looking left to 11h
Again, the upper and lower reflections are directly on top of each other.
This gives me a view of maybe 10h, 11h out of the cockpit.

4) Looking right to 2h
Now I aligned the reflections so that the upper and lower are staggered (imagine a vertical line connecting right side of top blip with left border of lower blip).
This gives me a view over my shoulders, maybe 4h or 5h out of the cockpit.

5) Looking left to 10h
Same story to the left, again with a vertical line to be envisioned between upper blip's right and lower blip's left border.
As you can see I now don't look over my shoulder, but still look just a bit to the left out of the cockpit, again maybe 10h to 11h.

Note that also the yaw-gauge already detects a lower "left sided" input than when I do the same thing to the right, even though the blips seem to be nicely mirrored...
Now I can try anything I want: shift the TrackIR left to right and back, move the clip around... - but the result is the same: always looking right works well, looking left gets stuck at 10o'clock!
Of course I checked if the yaw-profile makes any sense, and yes, it's symetric.
Does anybody have an idea what causes this behaviour and how I could correct it?
Many thanks in advance for your insights!
Markus