Shared here: https://eu.forums.blizzard.com/en/wow/t/windowed-fullscreen-3d-issue/68341?u=kiyo-twisting-nether
But may be worth mentioning here also.
Classic client fails to load in Fullscreen mode, whereas retail client works fine.
It works fine for me so more information is probably required.
Turn off any overlay apps like Windows Game Bar, MSI Afterburner, Steam or Discord. Some posts are saying it’s caused by Discord’s overlay feature.
Has anyone managed to play Classic with the Window (Full screen) mode enabled?
I can get it to work on retail, but a guildie mentioned the same thing, so I reckon this could be a small glitch.
The error reads: "World of Warcraft was unable to start up 3D acceleration.
I have even tried lowering Graphic Quality, but no joy there either.
Above is the original post.
Extra info:
PC:
Win10 Pro 54
i7 5820k @3.30Ghz
32GB DDR4 RAM @1066MHz
Mobo: ASUS x99-Deluxe v1
Nvidia GeForce GTX 760 (MSI)
I have edited my first reply with some more info.
Super, it was Discord.
Cheers Raijin!
Ty! this helped me also=) was discord