Hi bwtr,
Thanks for your interest in this mystery.
I've tried again opening a new doc, just an empty scene at small, and when importing, I see the model name in the Instances menu, and the hot point appears in the grid. (I assume it is the hot point!)
I then try changing it's size numerically, with no effect. And no object appears in the workspace. I've also tried zooming out, so that I'm positioned somewhere near Timbuctoo, in case the object hasn't been positioned... still nothing. I then fire up C5Pro, and can import the object with no problem,

I'm on a Mac, btw. Thanks again for your help!