When playing God of War on GeForce NOW, if I select the "Microsoft Basic Renderer Device" and restart the game I see a black screen or very slow rolling game intro. How do I fix this?

We do not recommend selecting that value, as it will result in poor performance. If a user does select it, Geforce NOW will need to fix your savegame files and revert the "Default Microsoft Video Device" back to normal one. 

However this may produce “Cloud cloud save conflict” for both the Steam and Epic Games launcher because your local saves now have a newer modification date than the one in cloud saves from Steam or Epic Games Launcher. This should happen only once after Video Adapter misselection and happens because the information about the game’s progress is stored with the graphics settings in a single file.