Still problems with mastercam crashing my toolholders. Dirty bugger. Do a backplot, ignore the crashes on the outside of the part (assume that stock is gone), but note the collisions on the tops of the bosses. This is a model I drew up quickly for a reference. The result was worse on the actual model I have been working on. During the roughing operation I used on the actual part, it left far more stock on the tops of the bosses; resulting in the tool holder rubbing rather signifigantly (more than 0.050″). Fun times as you can imagine.