fullscreen error

What I expected to happen was...:
If you press F11 to return to the window mode, you can control the window.

What actually happened was...:
if you press F11 and then click again to make windowed mode you cannot press the button to increase the screen.

Steps to Reproduce:
Here's the video
http://www.youtube.com/watch?v=knkeClUjRw8&feature=youtu.be