This affects me too and I'm using Gnome Flashback on 16.04!
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https://bugs.launchpad.net/bugs/1392053
Title:
gnome-screenshot sometimes hangs leaving a transparent white square
over th
Public bug reported:
I installed Gnome Classic after upgrading to 16.04 from 14.04 and due to
the issues with the wrong nvidia driver being install (361), always got
a blank screen on login.
Had to manually install my driver from this page to fix the issue
http://www.nvidia.com/Download/index.asp