When I try and run it is not asking me to save to file, and has an all red surface in the view box. Usually I see a yellow lines build in as each pass is done. Set up on it is x=4", y=2.75", z height .875. step over .025. feed 20. I also tried .03 step over with same result. I have full version(licensed) on a win7 machine. Any clues as to why this is happening?