compiz.real crashed with SIGSEGV when attempting to switch users

Binary package hint: compiz

1. System -> Preferences -> Appearance -> Visual Effects.
2. Changed from "None" to "Normal".
3. Prompted to enable nvidia stuff (can't really remember).
4. Re-started at the request of step 3.
5. Logged in as User1.
6. Switched user to User2 using the little drop-down dialog in the top right handle corner of the screen.
7. Went to System -> Preferences -> Appearance -> Visual Effects to confirm that User2 was also using "Normal" effects.
8. Closed Appearance Preferences dialog.
9. Switched user to User1 using the little drop-down dialog in the top right handle corner of the screen.
10. Display went white.
11. Waited for a good 60 seconds, display still white...
12. On a guess I tried entering my password even though the screen was still white.
13. To my surprise I successfully logged in as User1.

Hope that's enough info...

(I've tried it a few times always to the same affect...)

ProblemType: Crash
Architecture: amd64
Date: Wed Apr 2 16:44:47 2008
DistroRelease: Ubuntu 8.04
ExecutablePath: /usr/bin/compiz.real
NonfreeKernelModules: nvidia
Package: compiz-core 1:0.7.2-0ubuntu2
PackageArchitecture: amd64
ProcCmdline: /usr/bin/compiz.real --ignore-desktop-hints --replace --loose-binding --replace ccp
ProcEnviron:
 PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/usr/games
 LANG=en_AU.UTF-8
 SHELL=/bin/bash
Signal: 11
SourcePackage: compiz
Stacktrace:
 #0 0x000000000040feb0 in ?? ()
 #1 0x0000000000412444 in eventLoop ()
 #2 0x000000000040d019 in main ()
StacktraceTop:
 ?? ()
 eventLoop ()
 main ()
ThreadStacktrace:
 .
 Thread 1 (process 6733):
 #0 0x000000000040feb0 in ?? ()
 #1 0x0000000000412444 in eventLoop ()
 #2 0x000000000040d019 in main ()
Title: compiz.real crashed with SIGSEGV in eventLoop()
Uname: Linux 2.6.24-12-generic x86_64
UserGroups: adm admin audio cdrom dialout dip floppy fuse lpadmin plugdev sambashare video