I have used Kicad version 4.0.7 for a long time. Yesterday Windows made some big update and today I can’t use EEschema (just coincidence?).
Cursor crosshairs will stuck all the time to the middle of the screen. I can still move the mouse cursor and change the tool. The problem is that I can’t click anything (I just get error tone). The click point seems to be at crosshairs, not at the mouse cursor. The problem can be fixed by saving the schematic or closing the window, but the error will appear again quite soon.