Hi,
I’m writing from Italy,
I have the same problem!!!
I have new VorpX 0.7.5, I set the rift to extended, I use VorpX Far Cry 4 settings, apply them, I start the game as administrator, Uplay is offline, overlay is disabled.
The game starts up fine, I see the double images on my monitor with the VorpX logo and VorpX settings, I can start the game, I see the rift has the head tracking, but no matter what I do, I just can not make the game run on my rift, only on my monitor. I also tried to set the rift as primary display, and in VorpX settings I tried using system settings and show on DK2 only as well, but no luck.