I was playing with the gdm accessibility settings, and selected screen
magnifier.

The screen was similar to the already attached screenshot.  The RHS of
the screen either showed just the background image, or black where the
screen content should be.  Only half the login chooser was visible. The
accessibility menu was hidden by the magnifier, and not visible in the
magnifier.

Further, when I tried to log in to any user, the login would start, and
then immediately quit and return to the login screen.

After various experiments (including installing xdm), I found I could
disable the magnifier by removing

/var/lib/gdm/.gconf/desktop/gnome/applications/at/%gconf.xml (from
memory)

Installing xdm caused several packages to be removed (e.g. at-spi), now
there is nothing in the gdm accessibility menu.

-- 
Visual artifacts
https://bugs.launchpad.net/bugs/416279
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