Bug#656762: gnome-shell: after "something went wrong" no chance to save any data at all

[G. Chris Hofmann]

I started having this problem recently and to lend some credibility to
the PackageKit theory, it started about the same time I installed
PackageKit.  I set the key as noted above and have not experienced the
issue as of yet.  I set the key last evening though, so probably not
long enough time has passed to make any drastic proclamations yet.