I’m doing some googling, first thing I found was dual monitors, I’d start with the reflex settings. I’m also seeing comments about this in other games, no solutions.
Ok, I have triple monitors and they always go black when I start 2 WoW clients. I have to usually restart my computer, as restarting windows explorer usually does not fix nvidia broadcast or all my programs using nvidia broadcast - discord, obs, etc. My 7850 gfx card from 2012, never gave me this problem. Something with my new computer and only with WoW, I can 5 Diablo 2 resurrected’s no problem. Thinking about switching to 4 monitors tomorrow when my new one gets here, I have an 80” giant desk