I have the Fonts preference for display of group and article windows in
my copy of MT-NewsWatcher set to Geneva 12.
Recently the font used in the comp.text.tex group window (the window
showing the list of postings) has begun randomly resetting itself to
what looks like Time 9 or 10. This occurs only in the group window, not
in the individual article windows, and seems to occur only for this
newsgroup among the 30 or so newsgroups I'm subscribed to.
Seems to go away after a Restart, then return after a few days.