Import of .mgu file from Band In a Box

I have created leadsheets in Band In A Box with a melody track. The melody track was inputted via a small Akai keyboard. It records as a piano patch. When I import this leadsheet file into MuseScore it brings in the proper notes and places the chords properly above the staff but it splits the melody track onto two staves. I cannot get it to import cleanly onto one staff. I have disabled the 'auto hand-set piano track' in BB and have set the clef to split at C2 in BB thinking lowering the clef break might help. Nothing seems to make a difference. Has anyone figured out a solution?