Can't Force Stem Up

Hallo. Things are going swimmingly, then I always seem to hit another roadblock. I just changed the clef of a part from bass to tenor cliff (with a little 8 beneath), for tenor voice. It changed the stem direction of nearly all the notes (see attachment) to down. When I try “force stem up”, either in the edit menu or in the right-click menu, nothing happens. Are there other options for doing this?
Screen Shot 2016-12-09 at 12.50.47.png

Try selecting the notes and choosing Edit > Stem > Remove Forced Stem to see if that sorts things out.

That was it! Thanks again.