@johann_i, unfortunatly the Luban CAM is an alpha product (CNC) is just about useless. if you want to work in CNC i strongly recomend using another program, Carbide Create, EstlCAM and Fusion 360 are all good options.
Carbide Create is acctualy giving away a full 1 year subscription for free. see the post below:
CNC free stuff - 1 year free Carbide Create Pro subscription