webpage in firefox is white when a compiz focus animation effect is enabled

Binary package hint: compiz

OS: Ubuntu 11.04 beta 1

This happens when:
1) Enable a focus effect like dodge, fade or wave.
2) Open firefox, browse to a webpage.
3) Open another application (I did it with the terminal)
4) I don't know if the two windows (firefox and the terminal) have to overlap.
5) Switch a bit between the two windows. You will see the content of the webpage is white.

Other effects I enabled:
 - The cube, with rotation, cube reflections
 - OpenGL, otherwise I couldn't enable the cube
 - GnomeCompability
 - Expo
 - Wobbly windows
 - Move Window
 - Regex Matching

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: compiz-core 1:0.9.4+bzr20110407-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
NonfreeKernelModules: nvidia
.proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
.proc.driver.nvidia.registry: Binary: ""
.proc.driver.nvidia.version:
 NVRM version: NVIDIA UNIX x86 Kernel Module 270.30 Fri Feb 25 14:34:41 PST 2011
 GCC version: gcc version 4.5.2 (Ubuntu/Linaro 4.5.2-8ubuntu1)
Architecture: i386
CompizPlugins: [core,composite,opengl,decor,gnomecompat,commands,move,regex,imgpng,wobbly,animation,cube,rotate,cubeaddon,expo]
CompositorRunning: compiz
Date: Sun Apr 10 11:53:09 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus:
 nvidia-current, 270.30, 2.6.38-8-generic, i686: installed
 nvidia-current, 270.30, 2.6.38-7-generic, i686: installed
ExecutablePath: /usr/bin/compiz
GraphicsCard:
 nVidia Corporation G98 [GeForce 9200M GS] [10de:06e8] (rev a1) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:3603]
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Beta i386 (20110330)
JockeyStatus: xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
MachineType: Hewlett-Packard HP Pavilion dv5 Notebook PC
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=8642424b-4e44-4914-801a-b87d000d6625 ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.41-generic 2.6.38.2
Renderer: Unknown
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 07/19/2008
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: F.07
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 3603
dmi.board.vendor: Quanta
dmi.board.version: 02.15
dmi.chassis.type: 10
dmi.chassis.vendor: Quanta
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnHewlett-Packard:bvrF.07:bd07/19/2008:svnHewlett-Packard:pnHPPaviliondv5NotebookPC:pvrF.07:rvnQuanta:rn3603:rvr02.15:cvnQuanta:ct10:cvrN/A:
dmi.product.name: HP Pavilion dv5 Notebook PC
dmi.product.version: F.07
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.4+bzr20110407-0ubuntu2
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.1-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1-0ubuntu3
version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
version.xserver-xorg: xserver-xorg 1:7.6+4ubuntu3
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu4
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.14.0-4ubuntu6
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu6