I had this problem again and found an error ("intel_do_flush_locked
failed: No space left on device") in the .xsession-errors log file that
gave me enough info to locate the following bug:

https://bugs.launchpad.net/ubuntu/+source/unity/+bug/977804

There is a work around suggestion on that bug that says to CTRL+ALT+F1,
then execute "unity --reset". That seems to have allowed me to continue
my session. It doesn't solve the issue, but it mitigates the need for a
reboot.

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https://bugs.launchpad.net/bugs/987034

Title:
  Unity Dash freezes Xorg when opened over chrome

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