I believe I have found the problem. CentOS version in use here is 6.4, and it seems 6.6 has the updated packages. https://bugzilla.gnome.org/show_bug.cgi?id=637095 https://bugzilla.redhat.com/show_bug.cgi?id=561904 https://rhn.redhat.com/errata/RHBA-2014-1499.html I have no access to BZ#902448, but there's some interesting reading in those bug reports ...