I am using this approach with open polylines extensively to mill a wide area sideways starting from outside edge of the stock. Never noticed such behavior. On Win XP and Linux. Only it will eventually require to reverse the poly to make the profile act at the correct side.Never used zero max crossover distance though. Once I experimented with it and crashed the tool. It seems that a value of zero affects the logic behind the toolpath generation. Not sure it is a bug or a feature.P.S. Zero crossover should not be used IMHO.
P.S. Zero crossover should not be used IMHO.