I can verify it’s from using the “High Contrast” setting. You can easily turn it on and off with Left Shift+Alt+Print Screen.
I knew it wasn’t my Nvidia Card because I just started having this problem with my new PC build using the SAME Nvidia 1080Ti card as my last build where Cubase worked just fine. (I’m waiting for Card prices to drop. Tom’s Hardware said to wait until the end of 2022 where Cards will be much better and possibly cheaper.)