The recent upgrade caused my Empathy client to somehow forget the accounts that I had configured. (The ~/.mission-control/accounts/accounts.cfg file is intact). A quick post to the devel list, here is what you need to do to get it working again:
chcon -t bin_t /usr/libexec/mission-control* /usr/libexec/telepathy*
That's a workaround for the time being. The bug should be fixed quickly.