I have experienced black screen every time after 15 or 20 minutes of use, with various planes in X-plane 10 JAR 330 IXEG 737300, Flight Factor 757 767 777 and A350. Same case with X-plane 11 b3 default 747400.
Without xEnviro and with it too.
When this happens the sim continues working but with black screen
I7 @ 3.4 ghz
32GB Ram
GTX980ti
Windows 7 64bit
X-Plane 10 v10.51
x-plane 11 Beta 3
FI XP Pro 1.71
VR: Oculus Rift
Thank You