VSS materials are based on Firefly render engine technology and unfortunately will not translate well in Superfly.  Take a peek at the Material Room set up and you will see dashed noodle connections between various nodes.  To systematically decipher where the connectors are and what they actually do is a nightmare, and I don't think you would want to spend time updating VSS for Firefly.  Your best bet is EZSkin 3 for Superfly, although some settings need to be tweaked for optimization.

And I agree with adp001, materials should be in the Materials section, not a MATPose file in the Pose section.