I can't get the chatbox to work at all, it leads to a 404 page error for some reason
Just try hitting the refresh button at the bottom (assuming that it too is showing up), otherwise you'd need to refresh the page.
Just tested it on Firefox with the same results. Can't edit on either too.
The only way around it is by turning off some stuff via Adblocker and when I do that, I run into that stupid popup. So I guess I'm screwed, for now...
All I can suggest is use Chrome with Adblock like I do...