Keyboard shortcuts not working

[AndreG]

Hello folks,

Some of the keyboard shortcuts on my Photomator don't seem to be working. When I press that key it returns a beep sound from my Mac, as if that key wasn't a registered shortcut. The help topic here: https://help.pixelmator.com/pixelmator-photo/3.0/#721 says that M should show me the original photo, but it beeps instead. So does O, P, X. However, A, R and C are working.

I am in the editing panel of a photo. The UI button at the top - which shows the original when I press-hold my mouse button - works just fine. But I didn't want to use my mouse to see the original. Anyone has any idea why?

Thanks!