Stephen J. Turnbull writes:
In the past, this seems to be related to particular window managers,
or maybe user usage patterns. Have you upgraded / changed anything
related to X? What is your window manager, operating system.
FWIW, I'm seeing no X errors or warnings (specifically, no BadWindow
or XtRemoveGrab messages) on Gentoo GNU/Linux with Xorg Xserver
1.11.0, freshly updated X libraries, and fluxbox window manager 1.3.1;
or on Mac OS X 10.6 "Snow Leopard" with the Apple-distributed Xquartz
server and quartz-wm window manager.
Note: similar reports in the past have never been diagnosed or fixed
AFAIK, they just mysteriously go away (or users find them harmless and
stop reporting them).
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