The files in question are for the sample project mannequin that ships with 4.8 (so Mannequin.mb and Mannequin_Export.mb, which I can confirm are present) - is it possible that the updated grey-guy mannequin broke compatibility with Maya 2013? More likely something is awry with my install. If you’re referring to the customMayaMenu.py file, I’m using the latest from dropbox.
I wonder if someone could post the templates for the grey-guy mannequin here? That’s really what I’m looking to get out of opening the file. 