I now have a new problem on my PC running Windows 10. Photoshop continues to run after I exit the program regardless of whether I shut down by clicking X in upper corner of window or from menu, File > Exit. It is using 10.8% of my processing power after exiting - see attached shot from Task Manager. I have checked that I have the latest video card drivers according to menu item Help > GPU Compatibility. I also used the Creative Cloud Cleaner following instructions in this link: https://helpx.adobe.com/nz/creative-cloud/kb/cc-cleaner-tool-installation-problems.html It behaves this way even though I do a complete power shut down, not just a restart. I am using the latest Photoshop version 23.2.1.