Hi Michael

When I import the model all the colours are washed out (almost white all over the model) until I reduce the specularity of the material.

I suspect I'm doing something wrong in Blender though. I only have a sun light in the scene but this effect is happening over the complete surface of the object as if it's trying to apply a specular highlight to the entire thing.

Edited to add a screenshot. This is how the model looks right after import. The sphere diffuse is dark green.