Hey. I saw your post in a similar topic where you mentioned your setup and since it’s almost the same as mine maybe what worked for me will work for you:
Right click on your desktop > Nvidia Control Panel > Managed 3D Settings > Program Settings > WoW
And set your chosen graphic card as Integrated one. Run WoW. When game starts and you are in character setting go to Options > System > Graphics and set to run in WIndowed only. Then go to Advanced and set your Graphic Card as NVIDIA one and not intergrated or chosen by the app.
Note that this is not an ideal solution, since you will experience quite large fps drop from what it was pre 8.1 (I was running in 60 fps in 8.0 and now it’s 30 in Zuldazar - so even less in raids - around 15 I assume).
If this doesn’t work and you are on latest graphic drivers then downgrade till it works, because I’m running on the ones before the latest atm.