Deleted kplayerprefs.yaml and the visuals look fine after restarting the game. But once past the menu screen, they glitched again on a loaded game. Deleted the file again. Started a new game and there were no visual glitches. Basically can't play my old saves though now.
Recently upgraded to Catalina. After using Airplay to show a friend ONI, now can't play ONI unless Airplay is on. If Airplay is off, the screen becomes very visually glitched. When using airplay, even if just for a separate desktop (not even showing game screen), game looks fine. Some resolution setting is persisting when it shoul dnot, I guess. Will attach screenshot of what it looks like without Airplay running.