We're sorry about the trouble with Photoshop 2020. Would you mind telling us when did this issue start? What macOS version are you working on?
Please try uninstalling & re-install Photoshop through the Creative Cloud desktop app to check if that helps. You can also try to reset the preferences of Photoshop using the steps mentioned here: https://adobe.ly/2Qzc0K3
thanks for your suggestion. I'll give it a try. I am using Mac OS Cataliina version 10.15.5. I have a new version of Photoshop installed and it di not work after the computer's first reboot with it. Other than that I am really enjoying the upgrades.
The re-installation was successful. Uninstalling the previous version turned out to be fussy though. I could see it removed from the Finder, but still stuck in the area where you Force Quit. Unplugging the computer and then starting up again solved the problem.