Deus Ex GOTY black screen

hello, there
an idea anybody?
I managed to start Deus Ex with dx9; Vorpx attaches and injects VR, but all it displays is a black screen – both on the monitor and in the headset. The Vorpx ingame menu is available, but switching from fullVR to other VR modes does nothing

if I run the game without Vorpx, it renders fine on the monitor.
This happens with both Steam and GOG versions, so it’s not some anti-piracy tool or anything.

maybe you’ve seen this with other games, any idea would be highly appreciated
thx