I just cleanly installed Ubuntu 11.10 (with new, clean home folder)
The Super key no longer calls up the dash. Was this behaviour changed since the previous release?
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Check the settings for Unity:
And double check that the keyboard shortcut for Unity is set:
I have no idea why this would make a difference, or if it is just a coincidence but, using the "Additional Drivers" tool I switched video drivers back to the "recommended current nVidia" and everything works fine. This problem has plagued a machine for months, and after the switch it is working 100%.