I sincerely apologize for not doing ` yum downgrade firefox`  on
working systems ( even the one at my home). I got problems right after
`yum -y update` upgraded firefox. I might be wrong regarding firefox
to bring up the problem, it might be something else on update list.
  I got issue fixed by back porting F21 packages to F20 on several Multi Node
Havana F20  systems Controller+Compute Neutron OVS&GRE (been built
in general due to Kashyap's posting @fedorapeople.org ) affected by those
`yum -y update`. The packages back ported are

1. openstack-dashboard.noarch 0:2014.1-1
2. python-django-horizon.noarch 0:2014.1-1

and in mean time Havana && Horizon Dashboard (2014.1) work together
with no problems , at least visible for me. I remember your warning about
keystone updates, which have not been obviously applied due to my not
awareness of them ( actually, I just don't know how keystone should be
updated to be safe on Havana ).

Thank you very much for your support.
B.
P.S. I just don't have Havana Cluster with backported packages for experiment