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When I use keyboard shortcut Alt+Space+X to maximize window, the window border always disappeared, and I can't handle it. So what's going on? How can I fix it? My Ubuntu version is 11.10. Thanks!

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a screen-shot will be good for understanding the problem – Black Block Nov 29 '11 at 21:26
And as a sidenote - I think you can press Alt + F10 for the same effect. – Elvis Stressborg Nov 29 '11 at 22:57
Try unity --reset on terminal – Tachyons Feb 17 '12 at 0:51

Simply move your mouse to the top of your screen and the menu of your window appears.
In fact your window border is merged with the screen border and top menu bar.

enter image description here

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Alt + F3

Advanced -> Uncheck "No Borders"

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A little more explanation will be helpful , since it will help many Future users not just the OP. – atenz Aug 22 '12 at 15:19

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