Martin,

Although I'm really bad at Art of Illusion, maybe I can help.
- You may have grouped the legs; ungroup them, apply the colour/texture again, and save.
- Make sure the texture is applied to the correct face: SH3D (or the Sunflow render engine) has a problem deciding which face to use. Models from Sketchup Warehouse exported in DAE format have this problem too. Reversing faces generally solves the problem.

Hans