Hi Michael

I now have 8.04 LTS plus latest updates on two machines. One still had the
problem but the other didn't. With a little testing, I have identified
there is NO problem on both machines with the following setting:

Appearance Preferences - Visual Effects - None

To experience the problem requires setting:
Appearance Preferences - Visual Effects - Normal
or
Appearance Preferences - Visual Effects - Extra

Both PCs are running the latest apt-get Nvidia OEM driver 169.12 and
the latest 2.6.24-18-generic kernel.

The blank screen seen after logout from the guest account is now white
and recovery is via ctrl_alt_bkspace which kills the original login
session also, so is not a work-around. At least no re-boot is
required.

Cheers
Alistair

-- 
Logout from a switched account fails to revert
https://bugs.launchpad.net/bugs/192798
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