[away3d] Black screen Broomstick

[kyma]

I've been having fun playing with the broomstick examples.  When I
tried to begin a project from scratch though, I'm juts getting a black
screen.  I can't see any objects.  I have checked, and they are
definitely being added to the display list, but I can't see them.  Is
there anything I need to set up in my camera/scene, or can anyone
offer any tips for debugging this, because I'm currently a bit stuck