I had tried disabling desktop effects on first user, which allowed
switching to a second user. Trying to log in as a third user
produced corruption again. I didn't think to disable desktop
effects on _all_ users. That will probably work around this
issue until it is fixed.
Affects me also, on Maverick 10.10.
01:00.0 VGA compatible controller: ATI Technologies Inc RV370 5B60 [Radeon X300 (PCIE)]
01:00.1 Display controller: ATI Technologies Inc RV370 [Radeon X300SE]
I had tried disabling desktop effects on first user, which allowed
switching to a second user. Trying to log in as a third user
produced corruption again. I didn't think to disable desktop
effects on _all_ users. That will probably work around this
issue until it is fixed.
Could this be related to Bug 656235?
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- ati/+bug/ 656235