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I,ve just installed 11.10 and I have this problem that sometimes launcher doesn't respond to mouse and it does not reveal. when I do unity --replace in terminal nothing happens, it just set the DISPLAY initial variable to :0 and then unity is gone. I should restart lightdm after to restore the unity.

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It is a known bug. I haven't experienced it in Unity 2D, though, so if it bothers you, you can switch to Unity 2D for a while until it gets fixed. Unity 2D is nice as well. You can try it by clicking the button next to the password field before you log in.

It's a workaround, but there's little else to do for now. Remember to install upgrades often.

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Please reference the bug! – Jorge Castro Oct 17 '11 at 0:35

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