Adding a voice half way through a piece
I have written a song with just the treble clef and then added harmony line half way through. I checked hide empty staves which looked ok but when I printed it the second stave didn't print the lines. It printed the notes and the treble clef sign
Comments
Please attach the score.
See:
https://musescore.org/en/node/289899
Sounds like you might have accidentally checked the "invisible staff lines" box in Staff/Part Properties. Just turn that back off. But if that's not it, then indeed, please post your score so we can understand and assist better.