[SOLVED] Primary monitor won't display games anymore

[NVIDIA has failed me...]

Hello!

I am currently having an issue where it appears that the newest Nvidia driver is causing issues for me with multi-monitor setups in ANY game. If I run a game at 1920x1080 or lower resolution, it displays on my secondary monitor which natively runs at x1080. My primary is at 3840x2160. No matter how many times I select 'display 1' in whatever game or program I am using, it still uses the secondary monitor for some reason.

The only workarounds I have found are upping the display resolution or running the game in windowed mode (can't do fullscreen as it just defaults back to secondary monitor for no reason.)

So far I have tried: Forcing the game to use the primary by editing the game's config files - No luck
Restarting PC - updating drivers - no luck.

Bonus issue: If I disable the display in Windows, or otherwise unplug it - any game I try to run afterwards doesn't work at all!

Is there any way to fix this issue so that I can get software to properly run on my primary monitor without changing the display resolution? This has really been bugging me and so far nothing has worked.
I am running Windows 10 Pro on an NVIDIA 980 GTX.

TL;DR I can't run any games on my primary monitor if it's >=1920x1080 resolution, it will only display on secondary monitor. Unplugging secondary monitor just causes the game to crash.
Help?

* UPDATE *

FIXED!
Cause was a buggy NVIDIA driver.

 

[NVIDIA has failed me...]

* UPDATE *

Okay if you're reading this nevermind, it had to do with a buggy Nvidia driver that was released on the 30th of August, 2019. I updated my NVIDIA Driver, restarted and since then the issue has went away. If you were affected, please update and/or reinstall your drivers - THEN change your screen resolution in your affected game twice, once to something else (and optionally another monitor), then back to your old desired screen resolution and desired monitor and all should be good!!

Cheers!