Dash does not display unless other windows are open

[Matthew Wedgwood]

When no windows are open on the screen, as when I've first logged in, the Dash refuses to open. The launcher bar works (hiding/showing, as expected), but clicking the Dash Home button or pressing the Super key does nothing. As soon as I open any window (usually I drop down Tilda using a key shortcut), the on-screen button and Super key both work again.

This problem started after an upgrade from Precise to Quantal.

ProblemType: Bug
DistroRelease: Ubuntu 12.10
Package: unity 6.10.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-19.30-generic 3.5.7
Uname: Linux 3.5.0-19-generic x86_64
NonfreeKernelModules: fglrx
.tmp.unity.support.test.0:

ApportVersion: 2.6.1-0ubuntu6
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,put,regex,move,vpswitch,imgpng,gnomecompat,animation,workarounds,unitymtgrabhandles,place,mousepoll,snap,expo,resize,wall,fade,grid,ezoom,session,scale,unityshell]
CompositorRunning: compiz
Date: Fri Dec 14 08:19:19 2012
DistUpgraded: 2012-09-06 09:55:41,509 DEBUG enabling apt cron job
DistroCodename: quantal
DistroVariant: ubuntu
DkmsStatus:
 fglrx, 9.000, 3.5.0-19-generic, x86_64: installed
 virtualbox, 4.1.18, 3.5.0-18-generic, x86_64: installed
 virtualbox, 4.1.18, 3.5.0-19-generic, x86_64: installed
EcryptfsInUse: Yes
GraphicsCard:
 Advanced Micro Devices [AMD] nee ATI Redwood PRO [Radeon HD 5500 Series] [1002:68d9] (prog-if 00 [VGA controller])
   Subsystem: XFX Pine Group Inc. Device [1682:3051]
InstallationDate: Installed on 2012-08-11 (124 days ago)
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 (20120425)
JockeyStatus:
 kmod:fglrx - ATI Fire GL (Proprietary, Enabled, In use)
 kmod:fglrx_updates - Video driver for the AMD graphics accelerators (Proprietary, Disabled, Not in use)
MachineType: System manufacturer System Product Name
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-19-generic root=UUID=c296c803-7748-4fc1-8921-173f75886ec5 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to quantal on 2012-09-06 (98 days ago)
dmi.bios.date: 09/10/2009
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 0603
dmi.board.asset.tag: To Be Filled By O.E.M.
dmi.board.name: M4A785T-M
dmi.board.vendor: ASUSTeK Computer INC.
dmi.board.version: Rev X.0x
dmi.chassis.asset.tag: Asset-1234567890
dmi.chassis.type: 3
dmi.chassis.vendor: Chassis Manufacture
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr0603:bd09/10/2009:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKComputerINC.:rnM4A785T-M:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
dmi.product.name: System Product Name
dmi.product.version: System Version
dmi.sys.vendor: System manufacturer
version.compiz: compiz 1:0.9.8.6-0ubuntu1~test1
version.fglrx-installer: fglrx-installer N/A
version.ia32-libs: ia32-libs 20090808ubuntu36
version.libdrm2: libdrm2 2.4.39-0ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 9.0-0ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 9.0-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.13.0-0ubuntu6.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99~git20120913.8637f772-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.9-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.2-0ubuntu3