Whole desktop black screens (high settings)
This may or may not affect you.
I’ve recently heard of MSI Afterburner’s overlay causing some issues with black screens with GW2. Perhaps you use this or other overlay’s.
Good luck.
Some people have found that GW2 randomly going black was caused by their router/network blocking a port or possibly modifying a certain packet. You can try using the “-clientport 443” (or 80) command to see if running GW2 on port 443 changes anything. If that doesn’t help, if possible, try bypassing the router just to confirm if it’s actually a problem. If it is, try opening port 80, 443 and 6112, then disabling port scan and DoS protection, then the router’s firewall. What works varies by the router.
I disabled all overlays and it’s still happening
It’s not just GW2 going black, but my whole desktop.
now fixed! Not sure which one of these three things did it: rearrranged my RAM sticks, re-plugged the GPU power cable, clean install of Nvidia drivers without the HD audio driver