its the group lines that have no group name that mess up. for example, usemtl armbandright g mrshould f 372/71 373/70 168/19 f 372/71 168/19 193/18 usemtl skin g f 225/36 226/151 373/70 f 225/36 373/70 372/71 curiouser and curious. I'm going to try a faux name and see if that fixes things.