As of the last patch, the dev team said that the "black screen" issue was known and resolved. It still persists, mostly in Vashj'ir, but it's still there. Screen goes black, you're still in the game unable to do anything. If you click on the WoW window, you'll get disconnected. Hope this can be resolved Kind regards Nyvelle
99% of the time you can do a /reload ui and it fixed it without crash... still annyoing but its a minor fix for now.