I got an official response from support on this that the model is using thickness below .4mm which is the nozzle size of the 3D45. .4mm is the industry standard, so support recommends always using .4mm part thickness.
I have the same problem. I've attached a wireframe bird that shows as zero build time and doesn't print--it starts and says build done immediately. The original file and simplfy3d gcode that is broken are attached