I have found the issue that causes this, but wanted to report it somewhere.
For some reason with this model, if I have Hot Tub/Spa Heater set to electric heating, I get this error: 1.xml: Error: Expected argument 1 of type double, but got NilClass nil
https://www.dropbox.com/s/0ja3r31lwmaq7df/Eagles%20Nest%20-%20CD%20-%20pEUI.BEopt?dl=0
Any other fuel type seems to be fine. And when I open the demo files and set their Hot Tub/Spa Heater to electric, they seem to be fine.
This isn't a killer for my analysis, but it took me a good 45minutes to track down the issue.