I’ve exported from Blender a simple Line. Imported it as OBJ to TD. Had to add an edge to the OBJ and now both lines have the same: 2 points / 1 primitive / 2 vertices / 1 polygon when I look at the info.
If I pass through the Laser CHOP the OBJ one, it does nothing (as shown on the image) but if I pass the TD Line SOP it works as usual. And they look exactly the same, apparently.
Based on the MMB info it looks like the imported OBJ’s points are out of bounds – the line’s x,y points should be between [-1,1] for output from the Laser CHOP. You could scale it down uniformly with a transform SOP, or use the X Scale and Y Scale parameters on the Laser CHOP to get it to an acceptable size.