I have English version of Photoshop CC on English Windows 10 and I use Finnish keymap. For years this combination worked fine. Recently all keyboard shortcuts stopped working. If I change my keymap to English, they work fine. This is of course not acceptable solution as I can't type Finnish characters with English keymap. Adobe support confirmed that Photoshop really expects the English keymap if Photoshop is installed in English. I think this is a bug.