It seems like the first one, with Blender atleast. Today I also tried your program with an exported model as .fbx in google sketchup, which worked except it rotated the model (as in tilt or roll [in comparison to MED import which has the right angle]).

ps: anyone noticed that sketchup models have an open mesh? Even when I import it in MED., edit, seems to be only the case for .fbx exports not .obj (importing it as .obj shows a closed mesh in the mesh tester)