Develop in Swift Explorations/Xcode 13: downloaded lessons not loading while working on programming files

Hello I am teaching xCode using the textbook Develop in Swift Explorations/Xcode 13.  We're using the associated lessons in the xCode Dev environment. 

We're having issues with the lessons not completely loading - the results panel is blank.

We've tried restarting the program, the computer, and toggling to the previous lesson within the program to try and get it to reload. Nothing resolves it.

The files have been downloaded. Perhaps they take alot of RAM to run, and the computers are full? I've looked at the RAM and seem to have enough, but maybe not?

Help/advice appreciated.