I appreciate this thread is quite old but as it was the one I found from a google search I thought I’d add my finding for others that have encountered the same problem.
I was have exactly the same problem Staniol was having, even the screenshot at the CTD was the same. I tried all the solutions mentioned throughout the thread with no luck.
Then I found the problem. Falcon BMS must be set to Full Screen and not windowed or borderless for VR to work.
Sounds obvious now but historically Falcon BMS in Full Screen was problematic and borderless solved a lot of issues.
Hope this is of use to anybody who has a similar problem