[Inkscape-user] Live path effects not working?

Hello, people.

I have just installed the lastest snapshot of Inkscape from the CVS, and it looks very promising (although I am not quite satisfied with the docked windows).

I am trying to follow the steps listed in: http://inkscape.org/screenshots/gallery/inkscape-0.46-lpe-pathalongpath.png

I get to the point where the fish is attached to the skeleton path, but despite the fact I can "edit on canvas" it, whenever I cease editing the fish, it disappears, only the skeleton remaining visible. The fish is still there, though, because I can edit it again.

I will attach a sample SVG.