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When I click the Workspace Switcher button (or a button I've mapped to my mouse to do the same task), the screen shows several artifacts and I cannot switch displays properly.

Here is a picture of the display after I've clicked the Workspace Switcher button:

I have an nVidia n260 video card with dual displays connected

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noone? I could use some help here. – AdamOutler Oct 19 '11 at 21:54
up vote 1 down vote accepted

The problem was a compiz plug-in which was incompatible with this version of unity.

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Can you edit your answer to say which compiz plugin it was? This might be useful for other people having the same problem. – Oli Oct 31 '11 at 14:40
I can't. I'm sorry. It was something like desktop wall or cube or something.. I don't know which one. – AdamOutler Feb 12 '12 at 14:43

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