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[proteus <1003057@xxxxxxxxxxxxxxxxxx>]

Same here, and it happens with all sorts of applications - though I
don't have a clear reproductible procedure.  It seems to happen
especially when switching fast between applications or workspaces.

Usually I loose one application/window, but just now I lost them ALL,
across ALL workspaces. I can switch between workspaces, but I see no
windows (ALT+TAB, Win+W).

Besides switching workspaces I can't do anything else, no system menus
respond, I can't start anything from the Launcher (even if I use the
middle button, to start a new copy of an app). The Win and ALT keys
don't do anything, there is no menu popping up.

Actually, when I press Win+W there is one effect: the taskbar will say
"Ubuntu Desktop", but that's all. CTRL+ALT+Backspace doesn't do anything
(I think it was supposed to kill X, right?).

I can ssh into the box from another machine, I can also do CTRL+ALT+F2.
I tried "init 3" and then "init 4", but it didn't restart X as I
expected and the GUI is still unusable.

Please advise what debugging information do you need.

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https://bugs.launchpad.net/bugs/1003057

Title:
  Windows disappear unexpectedly when switching application

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