By chance do you have any flash running in the firefox windows when this
occurs? If so, then it may be related to bug 14911.
In any case, if you have encountered this after upgrading to feisty from
a prior version, can you please re-run the xorg configuration tool, to
see if it is simply some leftover from your prior xorg.conf? (Note, if
you have binary video drivers installed, you may need to remove them
first, and then reinstall after.)
$ sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.dapper
$ sudo dpkg-reconfigure xserver-xorg
[Moving into xorg package - it's not yet clear this is in libx11.]
** Changed in: xorg (Ubuntu)
Sourcepackagename: libx11 => xorg
Status: New => Incomplete
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X11 warnings after upgrade when moving windows
https://bugs.launchpad.net/bugs/120939
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