So basically, I reinstalled Diablo 3 recently but after opening the game I immediately saw the D3D error message. My computer used to be able to run Diablo 3 fine sometime mid last year, so I don't know what the problem is. Any help would be appreciated so that I can continue playing the game.
I've been looking around for threads regarding this error but all of them are extremely outdated.
I got the same message and also "Settings: Application Diablo III.exe cannot access graphics hardware." My rig is Intel i7-6700, Nvidea GeForce GTX TitanX with 12 mb VRAM, 32 gb DDR4 RAM, Windows 10 home, G-sync monitor at native 2560x1440@60hz. The game ran perfectly up untilPatch 2.4.2 came out. Now it glitches & pauses while everything being displayed, except the ground or surface where the action is happening, disappears momentarily.
I answered in the other thread with one thing you could check, maybe try additionally also to limit your foreground and background FPS; additionally I remember having similar problems way back, and I always used VSYNC and Fullscreen mode in Diablo III ever since, due to random issues if not used that way.