confusing bug of unable to siwtch to / show new windows

Hello. The problem, which I believe is a bug, is hard to describe but keep
coming back to me in the last a few years, recently with Ubuntu 11.10
happens much more frequently than before.

A newly opened window, be it an application (e.g. Firefox) or an fluxbox
tool (e.g. fbrun), would show on the iconbar but does not draw itself. You
can click it on the iconbar, but it wouldn't show up neither. The window, if
having focus (you can identify that by the color of it in iconbar), can
accept input. say I can keep typing in fbrun to launch a new program, but I
wouldn't see fbrun itself.

When this happens to a window, all newly opened window after it would stop
showing up too. Older windows are not affected. Thus, when it happens I
usually logout and login again.

It's extremely difficult to determine which application in my .xsession is
related to such a behavior, thanks to the difficulty to reliably reproduce
it. e.g. Once I removed xcompmgr from .xsession and this problem stop to
happen, thus I thought they are related, until a month later this bug happen
without xcompmgr again. It would take a season (3 month) to figure out the
relationship between the exact .xsession item and the bug, if there is such
a relationship.

So where should I look for for solving this issue? Thanks.

Best.
--
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