Yes, I am, both on export and re-import....and thanks for getting that added to blender!  I also make sure Vertex Order is also selected.

I'd be happy to send you a .blend file if you want to test an export of it.  It seems to be very repeatable.  I am just using a derivative of the free Omnisuit OBJ that @corinthianscori made and is on ShareCG for learning, so I would not be losing anything ;-)