When I drop a gcode-file into Luban, I get a message that it cannot be done. What happens is that Luban loses the top-line of the program. The only way to stop the program now is to click File and go down to click Exit. Though it will import the gcode-file despite the message and Luban will continue doing the job. But it is a bug, for it should not happen. Luban loses the top-line of the program.