I think this has been reported before.
Changing preferences for fingerings does not work.
Changing prefs (size, font, position) does not update for given fingerings, and when selecting note+doubleclicking fingering it appears with the default values.
When dragging a fingering onto a note at least the desired positon is ok, but not the selected font/size.
(I guess there are some other text related issues, but I don't know now.)
All new releases of muse, on Mac PPC