pixelated area flashes with a squarish black area

[bellevue scott]

I've been seeing this strange screen flickering with pixelated squares. It only happens with photoshop, and if you zoom in or out it goes away. It only happens when zoomed at certain percentages, although I haven't figured out which ones. When it does happen I can't make it go away. Then I'll open another image and it doesn't happen. Has anyone seen this issue? I don't know if it's the monitor/OS, or Photoshop, but I've only ever seen this happen in PS.

I'm including a link to a video screen capture that shows the issue.

https://youtu.be/LkiLdg0wg98

I'm on a MAC Pro

3.5GHz 6-core Intel Xeon E5

64GB 1866 MHz DDR3 RAM

AMD FirePro D700 6144 MB X 2

WACOM Cintiq 27HQ

Adobe PS 20.0.1 cloud

[JJMack]

Check that all Apple Updates are installed on you Mac machine model.  If they are in your Photoshop Preferences try turning off use GPU in the Performance section. Also try checking use legacy Composting in you Preferences  performance section

[bellevue scott]

Thanks. All apple updates are installed. As for turning off the use GPU for Photoshop, that's kind of a non-starter as it would dramatically slow down PS performance, and I go through a lot of very large files every day.

[JJMack]

Some Photoshop features require a GPU to operate so they would not be available if you turn off GPU support.  However, turning off GPU support will not slow down the rest of Photoshop much.  The Whole idea of turning off GPU support is to just test if you problem is related to your Display Adapters Device Driver.  Apple controls which device drivers can be installed on your mac.   Windows and Linux users can get updated device driver from the Display Adapter manufactures.  Apple does not let them supply device divers to Mac users. They need to go through Apple.

[bellevue scott]

On the Mac you cannot update the display driver without updating the OS, and I'm on the latest version without upgrading to Mojave, which I'm not prepared to do at this time. I'll try and turn off GPU in PS next time I see it. it's kind of random, and doesn't happen all the time.

BTW I did see it a bit last night using Illustrator, which would sort of point to an Apple problem and not a PS problem.