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No duplicate of bug #728101 for me: it doesn't happen (only) when closing lid, but also just leaving the laptop alone for enough time; it happens to me 1-2 times per day, after the upgrade to Ubuntu 11.04.
The last messages I always find in syslog, after Ctrl+Alt+F1-ing to a console, are:
May 16 09:41:35 adaca-PSL4BE-2 acpid: client 29751[0:0] has disconnected
May 16 09:41:35 adaca-PSL4BE-2 acpid: client connected from 29751[0:0]
May 16 09:41:35 adaca-PSL4BE-2 acpid: 1 client rule loaded
The 29751 process is X.
Usually, at this point I follow the PID chain until the gnome-session, and kill it; going back to the UI with Ctrl+Alt+F8 gets me the login form, I can then login but my previously opened windows are gone.
I'll try the "compiz --replace" fix next time, and post an update here.