Mac,

What do you mean, the "Sheet Window", is this the same as the Notation window?

When I select the Notation window (ctrl-W), and click on the "M" icon, I can see the Melody line. When I hold the ctrl key and simultaneously click on the "M" followed by the "S" (solo) key, the melody line disappears, and the solo line is displayed after bar 60.

So it doesn't work. I also did the factory as you suggested, but it didn't make any difference.

Paul