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Hello again, I have now got both software versions 3.12 and 4.1.29 installed.

As before, 3.12 works with 'No Limits' although a little erratic (it was always like this)
It's a pity 4.1 dosen't, as I'm sure that would be a lot smoother.
Not to worry

Regards
Steve

I will bring it up with the developers

The issue seems to be the way the TrackIR 4.xx software was simplified, to take advantage DirectX/Input. This may have affected some older games that may be utilizing Direct X differently or strangely.

The reason we simplified the Direct X implementation, is so that we could focus on getting native support for the TrackIR in new titles.