Comment by fluoridation

This is Windows, but it might shed some light on the situation. I have a Qt application that I made, and occasionally when I switch from one window to another, the cursor doesn't switch from resize to normal, or vice versa, until I move the mouse. The precise effect is consistent, but difficult to describe, hence why the "sometimes". I think it happens because I'm not handling the window switch event as one that may require re-evaluating the cursor shape.