Today my photoshop is showing the entire window as red, when I go to interact with canvas it flashes briefly to white then back to full read. quick mask is not on, i uninstalled and reinstalled.
If you disable GPU acceleration (Ctrl/Cmd + K on your keyboard > Performance > Graphics Processor Settings), does it continue to happen? I'm guessing GPU driver issues. Try updating or a reinstall of the GPU drivers (I don't even know if that's possible on a Mac) if that's the case.
I know that, beginning with 22.x onward, requirements for Photoshop have increased but my guess is that Apple simply may not have updated the GPU driver for that particular model. See more here: