Hi mjohannes, I have started SM2.0 life in last Dec. Today I have just install trial version of the VCarveDesktop & have imported SM2.0 post processer, too.
Your Luban’s screen copy is look like mine; many unknown circles in the window. I reviewed the gcode file and found G2/G3; G-code for arc and Luban did not handle G2/G3 correctly, I guess. There were some discussion for G2/G3 arc G-code support in the farmwear & Luban in the past in this forum as follows.
Does Luban support Gcode G2 and G3?
Fusion360 post processer for SM2.0 dose not output G2/G3, it may convert arc to many small G1, I also guess.
I hope this provide some help for you & me and need much help from experts. Thank you in advance.