A warning that the retract height is set to zero when exporting your gcode. This just happened to me and I didn’t catch it until the drag bit put a nice unwanted diagonal scratch across half a 12"x12" acrylic sheet. I have caught this happening in previous versions of CC prior to cutting. I have not ever set the retract height to zero. I am not quite sure what steps causes CC to set the height to zero once in a blue moon, I just know it happens.