I assumed it was something like an update in progress when I also got the Demo error, but thought I'd report it anyway just in case it wasn't.

When I went to Books just now, I had to mark all as read, even though there were 0 unread messages. Odd, but it worked. And when I went to Demo, I had to log in manually, as though my FA cookie had disappeared. But it recognized my regular login info. Is there a separate cookie for Demo? I'll have to make sure I don't delete it in my nightly cleanup.