Yes thank you for the response and possible solution. Maybe AMD will release some drivers that fix this issue. At least now I know its not an issue with Vorpx.
I just got my rift a week ago and then discovered vorpx. I made my post first but then found yours. I think the issue is that there are very few of us who have a rift AND have vorpx so not as many people having our issues. Is your video card an AMD card?
I have the exact same issue. It also happens with Quake 2. Did you ever find a resolution?
I cannot play Amnesia Dark Descent at all. Both eyes get flashing flickering of the game and the frame rates is so low it would be less than 1 frame per second. Im running win 10 64 bit. AMD fx-8350 Black edition and an R9 390x video card. Quake 2 does the exact same thing. I have tried many settings to no avail. Games like Skyrim and fallout 4 run just fine. It seems to be a possible issue with Open GL not really sure. Any help would be greatly appreciated.