So I loaded up Half-Life 2 with vorpx and adjusted the settings to create the best experience. I noticed though that there doesn’t seem to be any head roll tracking. Any ideas?
The only thing that comes to mind is that you might have accidentally disabled the headtracking roll. It can be activated/deactivated separately from the rest of the head tracking.
You can check this either in the vorpX Config panel or in the ingame-menu (input page)