[gnome] minimise all windows / show desktop

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http://ubuntuforums.org – Okay, yes, it's been addressed many times before, but I've never seen my particular problem come up. Using a clean install of Ubuntu 12.04, with Gnome Classic for the desktop. I have set super-d to minimise all windows / show the desktop. But when I use it, something odd happens. Instead of minimising to the task bar, my windows vanish momentarily and then slide back into place from the corners of the screen. Do it again and they slide on from the diagonally opposite corner. Anyone else ever had this happen? (Hardware)