I just got a new PC & installed Ubuntu MATE 20.04. That went without a problem. But after installing Photoshop CS2 via PlayOnLinux, the ALT key (cloning) isn't working. Under the "normal" Ubuntu 18.04 (Unity) I solved this problem by changing the assignment of the ALT key, but with MATE this didn't work. In "Control Center > Keyboard > Keyboard Preferences > Layouts > Options" I changed "ALT/WIN key behaviour" from "default" to "ALT is swapped with WIN", but this didn't help. Does anyone have a solution here?