I'm in the same boat. I'm using Intrepid on a thinkpad R60.
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Window previews don't disappear.
https://bugs.launchpad.net/bugs/296087
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I can elaborate on the issue some... Previews which should contain
animations (such as videos or scroll bars) don't animate when you take
your cursor off the task bar item. Not sure if this is useful
information or not, but it's more to go on nonetheless.
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Window previews don't disappear.
