I just experienced somewhat of the same thing on my desktop system. My gf was logged in, I switched to my user, the switched back to hers. When I switched back to her user, the mouse was all messed, and some of the graphics were messed up. I switched back to my user where the graphics were so messed up, I couldn't do anything. So I switched back to her user and X froze. I had to hard restart.
Athlon XP, Nvidia GeForce3 (binary drivers), Kubuntu 6.06, fully up to date.
I just experienced somewhat of the same thing on my desktop system. My gf was logged in, I switched to my user, the switched back to hers. When I switched back to her user, the mouse was all messed, and some of the graphics were messed up. I switched back to my user where the graphics were so messed up, I couldn't do anything. So I switched back to her user and X froze. I had to hard restart.
Athlon XP, Nvidia GeForce3 (binary drivers), Kubuntu 6.06, fully up to date.