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It just stopped working. After I boot Ubuntu it does not work. When I run unity --replace it works again, but after restart problem occurs again. And that happens on every reboot. I have some startup apps, but I don't think that can be the problem.

Any idea?

UPDATE:

Looks like I had some problems with firefox causing Alt+Tab to stop working. After reinstalling firefox and computer restart it works.

EDIT:

Well, this Alt + Tab window switcher preview is not solved. It stil happens sometimes after the boot. But I just figured that it works, but it is hidden by other windows due to wrong z-index positioning.

There is a bug https://bugs.launchpad.net/ubuntu/+source/unity/+bug/805087

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A little more detail would be great. Are you using any other special plugins? What is your Ubuntu version? Also please add the appropiate tags. – Sander Nov 21 '11 at 9:03
What to do with questions that describe known bugs? this has been reported on Launchpad and as such is now closed. – Marco Ceppi♦ Dec 5 '11 at 4:32

closed as off topic by Marco Ceppi♦ Dec 5 '11 at 4:32

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