Icons on the Unity panel aren't displayed

[Dmitry Zhigulin]

Binary package hint: unity

Icons on the Unity panel aren't visible, but on mouseover tooltip balloons are displayed, on click application is started.
(Ubuntu 11.04 Beta 2, Nouveau video driver)

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: unity 3.8.8-0ubuntu2
ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
Uname: Linux 2.6.38-8-generic i686
Architecture: i386
CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,titleinfo,snap,move,imgpng,commands,place,resize,regex,grid,vpswitch,gnomecompat,mousepoll,wall,animation,resizeinfo,unitymtgrabhandles,expo,workarounds,session,ezoom,staticswitcher,fade,scale,unityshell]
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1280x1024 1600x1200 1280x1024 1152x864 1024x768 1024x768 1024x768 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 640x480 720x400 720x400
 edid-base64: AP///////wAebWdD9hoBAAMOAQNoIRi16vYpolNHmSUQSEz//4AxTzFZcU9FWWFPYVmBj6lFwDQAmFEAKkAQkBMANuYQAAAeAAAA/QAyoB5VEgAKICAgICAgAAAA/ABUNzEwUEgKICAgICAgAAAA/AAKICAgICAgICAgICAgAC4=
Date: Sat Apr 16 00:02:11 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
GraphicsCard: nVidia Corporation NV34 [GeForce FX 5500] [10de:0326] (rev a1) (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110328)
InstallationMedia_: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110328)
InstallationMedia__: Ubuntu 11.04 "Natty Narwhal" - Alpha i386 (20110328)
Lsusb:
 Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
ProcEnviron:
 LANGUAGE=ru:en
 PATH=(custom, user)
 LANG=ru_RU.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-8-generic root=UUID=dc3c56b0-80c0-4842-ad28-6b263b05bf6d ro quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-8.42-generic 2.6.38.2
ProcVersionSignature__: Ubuntu 2.6.38-8.42-generic 2.6.38.2
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/28/2003
dmi.bios.vendor: Phoenix Technologies, LTD
dmi.bios.version: 6.00 PG
dmi.board.name: nVidia-nForce2
dmi.chassis.type: 3
dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd11/28/2003:svn:pn:pvr:rvn:rnnVidia-nForce2:rvr:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.4+bzr20110411-0ubuntu2
version.libdrm2: libdrm2 2.4.23-1ubuntu6
version.libgl1-mesa-dri: libgl1-mesa-dri 7.10.2-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental 7.10.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.2-0ubuntu1
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 2:2.14.0-4ubuntu7
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110107+b795ca6e-0ubuntu7