Description of problem:
With a phoebe3 Everything install:

I have my gnome session set to display two terminals at login. I can
immediately begin typing on one of them, but if I try to alt-tab to
the other, the screen appears to freeze. Clicking the mouse once
(anywhere) clears the problem, but this shouldn't be necessary.

Version-Release number of selected component (if applicable):
2.2.0.1-3

How reproducible:
Every time

Steps to Reproduce:
1. Log in, start two gnome-terminals
2. Log out, check "save current setup"
3. Log in again. Note that one terminal has focus (you can type),
   although its titlebar isn't highlighted. Do not touch the mouse.
4. Hit alt-tab and release
    
Actual results:
Screen appears frozen with outline of background window drawn over
foreground window. Tiny "alt-tab window" with two terminal icons is
also displayed. Subsequent keystrokes don't appear to work. Mouse
does work, but may disappear if moved outside tiny "alt-tab window".

Clicking mouse clears the problem. Subsequent alt-tab actions
function as expected.

Expected results:
Alt-tab should function properly before the mouse is ever clicked
or moved.

Additional info:
The problem doesn't happen if the mouse is so much as moved away from
the center of the screen before alt-tab is first used. It only seems
to happen when the mouse is not touched. The little window that pops
up when you alt-tab seems to "capture" the mouse and interrupt the
process.