Hi Larry, I'm glad that solved it for the time being! I think I'll update this so that if any of the contributing source objects has never been selected before (which only happens with scripting) it will use the order that the objects have been set on the factory. That should then give a way to control it with boolean union for scripts and also boolean difference will automatically give priority to the base objects over cutting objects since that's in a lower factory input.

Thanks for reporting the problem.

- Michael