Toon-ifying imported objects

Okay, I appear to have cracked the problem (of imported props, 3ds or Wavefront turning black in toon renders when an outline is added). The (convoluted) process for making it work is as follows:

1. Import the object.
2. Enter the Setup Room.
3. Leave the Setup Room. This will enable you to add the object to the Figure library.
4. Add the object to the Figure library.
5. Create a new scene.
6. Add the new figure to the scene.
7. Enter the Setup Room.
8. Leave the Setup Room.
9. Add your toon shading and outline to the object, and then render. Et voila!

Logically, there is no reason why this should work. But so far it appears to. :)