I have also seen this problem, and been able to reproduce it at least
twice after fiddling with the keys for a while. It seems to have
something to do with pressing the space key and/or maybe the mouse or
arrow keys or others while holding ctrl down and pressing tab.
My attempts to start up a replacement with compiz --replace didn't work,
even though I tried to use the environment from the original one which I
found in /proc, and I used the same command line arguments. Starting a
metacity also didn't work.
Killing compiz from an ssh session allowed me to save some files and
exit, but I wonder how I could have restarted a window manager.
It seems like having an option to restart compiz by killing it with
sigusr1 or something like that would make this a lot easier to recover
from.
Thanks for the tips on debugging - when I see this again I'll look at
those files.
Changing status back to incomplete.
** Changed in: compiz (Ubuntu)
Status: Invalid => Incomplete
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system hangs on pressing <Alt><Tab> while using Compiz-Fusion
https://bugs.launchpad.net/bugs/161000
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