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[Jordan Grant <1301623@xxxxxxxxxxxxxxxxxx>]

I have the same problem. It just started out of the blue a few weeks ago. I assume after some update as I regularly accept updates. Ubuntu 14.04 LTS Intel Core i5-3320M CPU on Lenovo Thinkpad T430s 64-bit.
System doesn't completely freeze because I can move between fields in the minaturized windows by pressing tab and can respond to some options.
Only way out seemed to be hard reboot, until I was shown a temporary fix:
cntrl alt F1 to get to a terminal
   log in with username and password
   unity --replace <enter>
   cntrl alt f7 to return to the desktop
but top menu bar did not return
had to shut down from the terminal
   sudo shutdown -h now

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https://bugs.launchpad.net/bugs/1301623

Title:
  unity freezes when moving windows among workspaces

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

Bug description:
  Sometimes In Ubuntu 14.04, when I move windows from one workspace to
  another, Unity freezes, letting me with this 4 workspaces overview. I
  have to use terminal and restart Unity to resolve it.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: unity 7.1.2+14.04.20140328.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-18.32~precise1-generic 3.11.10.4
  Uname: Linux 3.11.0-18-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell,dbus]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  CurrentDesktop: Unity
  Date: Wed Apr  2 23:26:06 2014
  DistUpgraded: 2014-03-18 07:46:56,695 DEBUG enabling apt cron job
  DistroCodename: trusty
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:365e]
  InstallationDate: Installed on 2014-02-10 (51 days ago)
  InstallationMedia: Ubuntu 12.04.4 LTS "Precise Pangolin" - Release amd64 (20140204)
  MachineType: LENOVO 10104
  ProcEnviron:
   LANGUAGE=cs
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=cs_CZ.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.11.0-18-generic root=UUID=3a918684-e656-4e86-9b7b-22e0fd6b2135 ro quiet splash vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to trusty on 2014-03-18 (15 days ago)
  dmi.bios.date: 03/21/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: ELKT31AUS
  dmi.board.name: MAHOBAY
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003 STD
  dmi.chassis.type: 13
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
  dmi.modalias: dmi:bvnLENOVO:bvrELKT31AUS:bd03/21/2013:svnLENOVO:pn10104:pvrLenovoC440:rvnLENOVO:rnMAHOBAY:rvr31900003STD:cvnToBeFilledByO.E.M.:ct13:cvrToBeFilledByO.E.M.:
  dmi.product.name: 10104
  dmi.product.version: Lenovo C440
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.11+14.04.20140328-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.52-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-1ubuntu1
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-1ubuntu1
  version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu7
  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: Mon Mar 31 16:48:50 2014
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.outputs:
   product id                                8192 
   vendor                                     LEN
  xserver.version: 2:1.15.0-1ubuntu7

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