Comment 18 for bug 877505

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John McPherson (john-mcpherson) wrote :

This warning message refers to a particular window, by window ID, so just posting the warning message is not very useful because it does not tell you which program Compiz is talking about.

Eg, for me:
compiz (core) - Warn: failed to receive ConfigureNotify event on 0x5c00003

If I run "xwininfo -id 0x5c00003" in a terminal, I see that Compiz is referring to Rhythmbox. Since I often close the main Rhythmbox window (and the process stays running in the background), it could be a race condition that happens just as the window closes. The warning by itself is pretty harmless.