Since updating to 1.21 I've had problems with:
F10 to full screen, this just shows the desktop but I can't click anything. Sound is still playing so the app is running fine, just not visible.
Minimise hides the title bar but leaves the window contents in the centre of the screen, clicking this brings the window back.
Opening something like chrome leaves the app silent and needs the option for background sound unchecking and rechecking to work. 
Are older versions still available to download?
