Using Edge:

Over the weekend, I noticed that when I logged in, I'd get all messages going back two days.
When I tried to post a new message or reply, the bottom pane would stay grey and no text box nor message buttons would appear.
Today can't even log in with Edge. The toolbar tells me I'm logged in as "anonymous"

Using IE 11:
To post this message, I logged in with IE 11. I still to all messages going back two days.