[ubuntu] Desktop switcher obliterates panels

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http://ubuntuforums.org – Hi, everyone, I'm in the process of finalizing an install of Precice Pangolin (12.04.1 LTS) on my laptop. I'm running the Gnome Classic desktop manager. My problem is that the desktop switcher (bottom right hand corner) always reverts back to a 2x2 layout after a reboot. When I right-click and change it to one row of 8 workspaces (as I was used to in my previous Karmic distro on that same machine) my top and bottom panels disappear, and the Ctrl-Alt-Arrow keys let me select 4 empty desktops from a 2x2 grid. And that's it - no way out except to go into a text mode console and reboot. W (Hardware)