Maybe this could be bug #1166765 ?
If it happens again, try to run `gsettings get 
org.compiz.core:/org/compiz/profiles/unity/plugins/core/ active-plugins` on a 
terminal, if 'opengl' and 'unityshell' are missing it's probably it

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https://bugs.launchpad.net/bugs/1309806

Title:
  Unity Broken Today - No Panels or Launcher After Logon

Status in Unity:
  New
Status in “unity” package in Ubuntu:
  New

Bug description:
  I installed the Ubuntu 14.04 64bit desktop on this ASUS F75A a few
  weeks ago while it was still in beta.

  Today, upon logging into this machine, the Unity Dekstop was missing
  the top-panel and the launcher. I had to then press the power button
  for 5 seconds to turn off this laptop because crtl-alt-t would not
  bring up a terminal.

  In order to submit this bug, I've had to boot from the recently
  released live DVD.

  I reinstalled Ubuntu 14.04 again today, onto this machine, but it
  didn't fix the problem; as soon as I logged in for the first time
  there was no panels or launchers.

  Ironically, when booting from the Live DVD, the launchers and panels
  show up fine.

  The laptop ran great for weeks on the 14.04 beta, but now a fresh
  install produces a corrupted Unity Dekstop.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.2.0+14.04.20140416-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CasperVersion: 1.340
  CompizPlugins: No value set for 
`/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Sat Apr 19 00:03:37 2014
  DistUpgraded: Fresh install
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics 
Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:14c7]
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: ASUSTeK COMPUTER INC. X75A
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/casper/vmlinuz.efi 
file=/cdrom/preseed/username.seed boot=casper quiet splash --
  SourcePackage: unity
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 05/22/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: X75A.415
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: X75A
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK COMPUTER INC.
  dmi.chassis.version: 1.0
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvrX75A.415:bd05/22/2013:svnASUSTeKCOMPUTERINC.:pnX75A:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnX75A:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
  dmi.product.name: X75A
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK COMPUTER INC.
  version.compiz: compiz 1:0.9.11+14.04.20140409-0ubuntu1
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.10-1ubuntu2
  xserver.bootTime: Sat Apr 19 00:01:20 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                               12623 
   vendor                                     SEC
  xserver.version: 2:1.15.1-0ubuntu2

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