Quick-Controls Have Been Disabled?

For some unknown reason, the quick control commands aren’t working e.g. CTRL Z = undo. Have I accidently switched the function off? If so, how do I turn it back on?

Many thanks.

Quick controls or key commands?

Go to the Key Commands window and test the Type in Key-field. Do you get something else than the key you pressed? If so, your Windows might have changed the keyboard language when you have pressed Alt+Shift. Change the behaviour from Windows. (If you’re on Mac, I don’t know…)