Sounds logical. Funny thing is that I would have added that code eventually, and it would have fixed it self. Gah! I spent hours trying to figure it out! It was giving me a headache. Good thing you were on the forum to save me more time. Adjusting the collision hull for lighting seems strange.
If this is the case there should be something about it in the manual. I looked long and hard and didn't find anything unless it is hidden well. Just a little blurb or something about lighting larger models, or a short explanation of how the collision hull relates to lighting.