interestingly, after purging the gnome-screensaver package, and rebooting on linux-image-2.6.34-020634rc5-generic, the problem goes away entirely.
However, when using the lucid stock kernel with gnome-screensaver removed, I get a garbled/corrupted screen after the first attempt to switch user. And this time it is fixed by a switch to/from a VT.
Summary: this issue is just getting murkier. But Chris might be on to something with the gnome-screensaver/ bug #555870 linkage.
@Chris, Bryce
interestingly, after purging the gnome-screensaver package, and rebooting on linux-image- 2.6.34- 020634rc5- generic, the problem goes away entirely.
However, when using the lucid stock kernel with gnome-screensaver removed, I get a garbled/corrupted screen after the first attempt to switch user. And this time it is fixed by a switch to/from a VT.
Summary: this issue is just getting murkier. But Chris might be on to something with the gnome-screensaver/ bug #555870 linkage.