Hi: Yes, I know about using the ECS button but it quit working for me. The keyboard shortcut for exiting full screen mode is to hit the ESC key.....did that not work for you?
The other method for exiting full screen mode is to push your cursor off the top of the screen to reveal (pop down) the normal red / amber / green pills, then click on the green pill to toggle out of full screen mode and return to standard window display.....did that method quit working for you?
I will try the second method when it happens again. The reason I never use the green button is because if puts things in full screen and takes away the menu bar which I always want to see. Let's see what happens. Thanks.