I’m having similar problems with the head tracking. The head tracking roll works, and I can move the vorpx mouse cursor around, but I can’t enable mouse look. When not using vorpx the mouse look works as it should.
I did find one order of events that could make mouse look work with vorpx but it was only in window mode. If I switched to window mode, then ended the flight and reloaded, then I would have working mouse look. But after switching back to full screen it would stop working again.