!! Important info !!
NVIDIA drivers 551.xx contain a DirectMode device bug, which makes them incompatible with XTAL runtime. We recommend using driver 546.01 instead, until this issue is resolved. If you need to use driver 551.xx, you can use your XTAL headset in 5K resolution mode, which isn’t influenced by this bug. You can switch between 5K and 8K mode on VR Tool Settings page in the Display Settings section.