Have been using the extension for over a year with no problems but this is what happened today:

1. Saved a session. Didn't see it in the list. Screen was entirely full and saw no way to scroll to see more sessions. Didn't see the new session.
2. Clicked on x on an old session to make room. Nothing happened.
3. Clicked on cleanup, thinking I could use that to edit the list. Nope - everything is gone. Any chance of restoring?
4. Clicked on save current session. No new session appeared in the list.

Not sure what to do at this point.