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I think I have a bug in unity.

Sometimes I move the mouse over the screen without doing something and it seems that Unity want to maximise a ghost window on the left of the screen or on the right.

Look at the screen copy here you'll understand what I mean :

What is the cause of this - should I file a bug report?

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closed as off topic by htorque, Jorge Castro, Takkat, Marco Ceppi Nov 6 '11 at 21:00

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I have seen the same issue a couple times when I last used Unity on my desktop. My thought is that it is definitely a bug. Whether it has been reported yet I do not know. – Christopher Kyle Horton Nov 6 '11 at 17:37
This is a bug - something we cannot help you with. Therefore I'm voting to close this question. A workaround would be to disable the Grid plugin in CompizConfig Settings Manager. – htorque Nov 6 '11 at 19:43
Yes It's all right now without the grid plugin it's perfect ! – David Nov 14 '11 at 20:22

I found a bug report of similar problems.

Bug #886084

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