In some applications (like gedit or MS Word) the standard ctrl + v / c / z / y / s shotcuts have stopped working.
Instead I have to use ctrl + ins for copying, shift + ins for pasting and so on.
This, as you can guess, is really annoying (though in gedit it strongly discourages cut and paste code if you know if I mean). But still, what have I done wrong and how I can fix it? In the system as a whole, standard shortcuts are working OK, and only some applications are affected.