@Werka, it works fine for me - afer disabling these shortcuts (Alt+N, Alt+S) I can now use polish characters normally. Make sure your keyboard is set to Polish - it happens to switch sometimes (you can set it by pressing Windows key + Space bar).
Yes, exactly! It's very annoying - makes typing in Polish impossible - and not just in Evernote, but everyehere. In the new version there doesn't seem to be an option to turn it off. Please help!