Something else I've noticed: the "Walk" animation is not defined in the starting project. Here's a screenshot from the original player model's file http://s3.kkga.me/pb-MN4EA1H223.png
Thanks, this should be fixed now.
I downloaded the course files last week and I still had this problem.
I just checked, downloaded, the course files, and opened the start/ project. Opened mannequiny-0.3.0.glb, and I do have the walk animation.
Is there anything notable in your setup or the steps you've taken?