Problem with windows 10 wherein a full screen app doesn't exit gracefully

I was playing GTA5 and when it quit, my monitor said it was going into standby mode.

I've been having problems with build 10074.

Anyway, a quick fix which doesn't involve hard-restarting is to follow this process and have faith:

Hold the WINDOWS KEY and push R
Type CMD
Type SHUTDOWN /L
Push ENTER

this causes windows to log out of your account and the login screen should appear. You can simply log back in.

Other thoughts:
Putting your computer in standby might also do it.
Maybe windowskey+L too.