Minor chords in a tablet only show the m but not the chord character

Minor chords in a tablet only show the m but not the chord character,
Instead of showing Dm, Fm, etc. it shows m, m, etc.
Musescore in the PC shows everything OK.
Another thing is that when I import from an XML file (an old score created with Sibelius) if it has two lyrics lines Musescore in the PC shows both lines correctly but then in the tablet both line are mixed and showed as a single line.