End-of-day update: post/pre transform morphs both seem to be working now, and I have two improvements to OBJ loading on my list for tomorrow.

primorge: I think your Blender exports should work if you export with normals and/or UVs, but that would be silly as a restriction, seeing as the script does not use either. Easy to fix, though!

-- I'm not mad at you, just Westphalian.