When tried to make this part the calculated tool-path cuts through my part. I am unable to identify the reason. All I was able to do is to remove stock geometry and then the tool-path is correct, but with a lot of air cutting.
I am on the BobCAD-CAM V24 Build 376.
File is attached.
My rapid plane was set to 0.5. Which is to low. With 2.54 everything is OK.