Here's an updated version of the Exporter 1024-08
Tolerance for deciding if 'distorted' textures relaxed further.
Issues with flipped-instances inside flipped/rotated-instances not having faces correctly oriented or messed up UVmapping is addressed.
The MTL defaults now generally match the Pro exporter; specularity=0.333, Ns=0, but ambient=diffuse_color, alpha=d AND =Tr etc.
The main changes are: