I found a similar bug in Fedora: https://bugzilla.redhat.com/show_bug.cgi?id=1005613#c16
It's the same version of gnome-shell and it is due to an incompatibility with a gtk-3.8.5. I think that this warrants a "breaks". I am trying now to upgrade gtk3 to the version in experimental. I'll if this helps. Gennady
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