When you press F11 to put Minecraft on full screen(or put it with the option inside Video Settings) all goes good, but then, after it, when you quit of full screen, Minecraft window cannot be maximized, but when setting on Video Setting Full Scren option to false manually, and then, restarting game, you can, but if not, it's imposible. Please, fix this, it's very annoying. This happens on all 1.8 versions but not on 1.7 or older ones. In the attachment you can see that you can't click the maximize button.