Gnome panel from time ty time goes to some strange state when 
I can not select diferent tasks, which are shown on panel.
I click and no effect whatsoever.
In the same time if I click on another desktop (on the same Gnome panel)
it swithes it OK. Also no problem to start any new task(like new terminal)
by ckicking on it on Gnome panel.
Also I can switch to another task by clicking on its window directly - it
works fine.
But again, when I click on a task on Gnome panel - no action whatsoever.

The computer is RedHat 7.0 beta setup as Gnome workstatios
with whatever default settings (windows manager, etc)
it comes from.
This type of behavior happens about once a week.
The only way to fix it - restart Gnome.