There must be something wrong in MR for it to be locking up....I would concentrate on just building the model for now mate...really it doesnt need to be textured just yet. Finish the model and then we can work on this problem, I had the same problem with my Spitfire model...something is a miss. I will have another look at it tomorrow mate and go through all of the MR settings. I am batch rendering at present so cant use my PC. If I am still awake I will re-open it and save and try some things for you ok?? Give me an hour or so