Players in Flows

I am making a big document, all my piano/vocal music into a songbook including some 52 flows. It was going swimmingly–I kept adding flows and the voice/piano players would be in each subsequent flow. But now there is just a lone treble clef and single quarter rest at the beginning of each flow, and if I copy paste any music in, I only get the one line. In the players panel both voice and piano are checked.

You need a time signature!

Check Galley View first. If the setup is right you’ll see all instruments there.

Are they checked both in the Flows panel and in the Layouts panel, in the card for the layout you’re currently viewing, which I assume is the full score?