Public bug reported:

Running Precise under VirtualBox with two virtual monitors, the global
menu drop shadow grows until it's a black bar the height of the menu
bar.  Focusing a window or taking any other UI actions that would affect
that drop shadowing resets it to its proper rendering and then it grows
again over the course of about fifteen seconds until it's the same black
bar.  Oddly, this doesn't show up in screenshots at all, I've resorted
to a camera phone picture that shows the problem.  This only manifests
with multiple virtual monitors, if I drop back to a single monitor, it
behaves as it should.

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.4.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.2.0-18.29-generic 3.2.9
Uname: Linux 3.2.0-18-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
CompizPlugins: 
[core,bailer,detection,composite,opengl,compiztoolbox,decor,vpswitch,mousepoll,wall,grid,gnomecompat,move,snap,imgpng,place,regex,session,resize,animation,fade,scale,expo,ezoom,workarounds,unityshell]
CompositorRunning: compiz
Date: Mon Mar 12 01:00:39 2012
DistUpgraded: Log time: 2012-03-09 01:08:58.391033
DistroCodename: precise
DistroVariant: ubuntu
DkmsStatus:
 vboxguest, 4.1.8, 3.2.0-18-generic, x86_64: installed
 virtualbox-guest, 4.1.8, 3.2.0-18-generic, x86_64: installed (WARNING! Diff 
between built and installed module!) (WARNING! Diff between built and installed 
module!) (WARNING! Diff between built and installed module!)
GraphicsCard: InnoTek Systemberatung GmbH VirtualBox Graphics Adapter 
[80ee:beef] (prog-if 00 [VGA controller])
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
Lsusb:
 Bus 001 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
 Bus 001 Device 002: ID 80ee:0021 VirtualBox USB Tablet
MachineType: innotek GmbH VirtualBox
ProcEnviron:
 TERM=xterm
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-18-generic 
root=UUID=e9fc079d-1344-41af-9e74-b855a61d3def ro quiet splash vt.handoff=7
Renderer: Software
SourcePackage: unity
UpgradeStatus: Upgraded to precise on 2012-03-09 (2 days ago)
dmi.bios.date: 12/01/2006
dmi.bios.vendor: innotek GmbH
dmi.bios.version: VirtualBox
dmi.modalias: 
dmi:bvninnotekGmbH:bvrVirtualBox:bd12/01/2006:svninnotekGmbH:pnVirtualBox:pvr1.2:
dmi.product.name: VirtualBox
dmi.product.version: 1.2
dmi.sys.vendor: innotek GmbH
version.compiz: compiz 1:0.9.7.0~bzr2995-0ubuntu5
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.30-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 8.0.1-0ubuntu2
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 8.0.1-0ubuntu2
version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu6
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 
1:2.6.99.901+git20120126-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 
1:6.14.99~git20111219.aacbd629-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.17.0-1ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:0.0.16+git20111201+b5534a1-1build2

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 precise reproducible ubuntu

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https://bugs.launchpad.net/bugs/952730

Title:
  Global menu drop shadow appears as black bar

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