Same issue here. Ofer's temporary fix works.

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https://bugs.launchpad.net/bugs/1160608

Title:
  launcher greyed out

Status in “unity” package in Ubuntu:
  Confirmed

Bug description:
  Running with the latest raring release.
  Occasionally when running various programs, Unity's launcher will become 
greyed out.
  Attached is a screenshot with the condition.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: unity 6.12.0daily13.03.25.1-0ubuntu1
  Uname: Linux 3.9.0-999-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu4
  Architecture: amd64
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Tue Mar 26 21:36:03 2013
  DistUpgraded: Fresh install
  DistroCodename: raring
  DistroVariant: ubuntu
  EcryptfsInUse: Yes
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:21ce]
  InstallationDate: Installed on 2013-01-18 (67 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Alpha amd64+mac (20130106)
  MachineType: LENOVO 4177CTO
  MarkForUpload: True
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.9.0-999-generic 
root=UUID=80adf852-4790-46ad-8afa-d0babb6179d6 ro 
crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 11/28/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 83ET67WW (1.37 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 4177CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: 
dmi:bvnLENOVO:bvr83ET67WW(1.37):bd11/28/2011:svnLENOVO:pn4177CTO:pvrThinkPadT420:rvnLENOVO:rn4177CTO:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 4177CTO
  dmi.product.version: ThinkPad T420
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.9~daily13.03.25-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.42-0ubuntu2
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.0.3-0ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.0.3-0ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu3
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.5-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.6-0ubuntu4
  xserver.bootTime: Tue Mar 26 15:43:57 2013
  xserver.configfile: default
  xserver.errors: evdev: Yubico Yubico Yubikey II: Unable to open evdev device 
"/dev/input/event16".
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu3
  xserver.video_driver: intel

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