Let me add also, when I press DEL for the vorpx in game menu and the game is paused I can actually do some head tracking but limited to a 2D plane as if watching a theater screen. But in the game itself it is as if the mouse got disabled by vorpx, something like that.
The behaviour with the menu open is the normal one, so tracker seems to be functioning.
Haven’t come around to test this yet, but one thing I forgot yesterday: in case you have a gamepad connected to your PC, you could try whether disonnecting it helps. Some games disable the mouse input when a gamepad is active, which also disables vorpX’s head tracking. Not sure ATM whether this is true for Risen 2.