Screen freeze = login experiation?
I was in the middle of a session when the screen suddenly froze after I had hit return when entering a phrase in Spanish. Nothing obvious unlocked things. When I did a browser page refresh, it asked me to log in. Then it started me over from the beginning in the lesson i had been working on. I don't know if my session expired (after about a week) or something else is going on. It would be nice if you could close cleanly before you need to log in again.
Otherwise, it's been fun...