Yes, we checked with her if we could save changes in a notebook from /notebooks-latest/ (we couldn't), and if we could save changes in her classwork notebook (in a folder called "Sistemas Estelares", probably, I don't have the name right now, but that's the name of the course), in the latest, we could save the work. But we don't know if the next time she starts the server it will load that version of her notebook or an older one.
We had a class last Tuesday (October 17th), and around 18:00 (21:00 GMT) she saved her work, closed the tab, and left. Today (October 19th) at 11:30hs (14:30 GMT) she started the server, and her code didn't show the changes she made two days ago.
It's not in a read-only directory at all.
This course is taught in Spanish and we cannot expect the student to post here in English, so I'm sorry I can't give you more information.