Compiz crashes when Opacity plugin is activated

[hype]

Binary package hint: compizconfig-settings-manager

When activating opacity plugin, ccsm crashes.

Then compiz becomes unstable, and particularly crashes when a tooltip appears.

ii compiz 1:0.8.2-0ubuntu7
ii compizconfig-settings-manager 0.8.2-0ubuntu1

OpenGL renderer string: GeForce 8600 GTS/PCI/SSE2
OpenGL version string: 3.0.0 NVIDIA 180.44

Ubuntu Jaunty 64Bits

ProblemType: Crash
Architecture: amd64
DistroRelease: Ubuntu 9.04
ExecutablePath: /usr/bin/ccsm
InterpreterPath: /usr/bin/python2.6
NonfreeKernelModules: nvidia
Package: compizconfig-settings-manager 0.8.2-0ubuntu1
PackageArchitecture: all
ProcCmdline: /usr/bin/python /usr/bin/ccsm
ProcEnviron:
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
PythonArgs: ['/usr/bin/ccsm']
SourcePackage: compizconfig-settings-manager
Title: ccsm crashed with IOError: [Errno 10] Aucun processus enfant
Traceback: IOError: [Errno 10] Aucun processus enfant
Uname: Linux 2.6.28-11-generic x86_64
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

[hype (hypeuser-lp)]

This bug is actually caused by the opacity plugin, which makes ccsm crash when activated.