Ok mate...after a lot of pain and time I have re organised your model. I have only joined the 2 halves together to get a feel for it...delete on half...otherwise I can send back the original for you. Basically delete ALL of your textures...you have mental ray set on HD 720...I changed that back to 640x480...low as possible and then applied a new PLAIN lambert to the whole model. I then tested it in Maya software..worked fine then bumped it into MR...it worked fine...I then put in a spotlight and IBL for lights and it still worked fine. As I suggested mate DO NOT try and texture, apply maps or ANYTHING while you are modelling...its just not worth mucking around with...as my friend Tweety says..concentrate on the model...I mess with ONE colour I have for a model...thats it...nothing else really. So try my new file and see how you go cheers bullet