I attached a patch to fix this in metacity at
https://bugzilla.gnome.org/show_bug.cgi?id=601907 .
** Bug watch added: GNOME Bug Tracker #601907
https://bugzilla.gnome.org/show_bug.cgi?id=601907
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metacity assert failure:
metacity:ERROR:core/bell.c:211:bell_flash_window_frame: assertion fail
(I think that one can also work around this by changing the "Visual
alert" setting in Sound Preferences -> Sounds to something other than
"Flash window".)
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metacity assert failure:
metacity:ERROR:core/bell.c:211:bell_flash_window_frame: assertion failed:
(window->frame != NULL)
https://bugs.l
