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

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