Comment 7 for bug 778195

Did not work for me, either. Interestingly, this bug does not appear on my netbook, just my desktop. But, the bug maintains across reinstalls. I even just had to reinstall from scratch due to a PSU failure and HDD corruption and the same problem behavior exists. But, the netbook has never had the problem. Both are running Ubuntu 11.04 x86_64 with almost exactly the same configurations. The desktop does have more Compiz plugins enabled, though. Given the other bugs related to Compiz settings, I wonder if this is related to a Compiz plugin? I may need to see if disabling any of the Compiz plugins resolves it.