See https://git.gnome.org/browse/gtk-builder-win/commit/?id=1cc8fe5887325713bc7c50caf7a07f6e0ccea21a I was getting the same problem as in here: http://lists.freedesktop.org/archives/fontconfig/2014-March/005149.html Why? no idea, but you can repro using the gtk-builder-win.
Fixed. Thanks.
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