This happens every time the on-screen secure keyboard is (automatically) enabled in any password field under Chrome. Letter keys will not respond anywhere (for example, words, notepad, etc.), while function keys such as <Enter> can still work normally. My current solution is to open a new Chromepage, go to the Google search engine (by clicking on a bookmark, as I can’t enter anything in the address bar), and then type something in the search field. After that, the letter keys will work normally again. Has anyone experienced it? Any solution would be greatly appreciated.