Fluffy, not sure what is going on there. It sounds like its something with your computer... Is there another one you can try it with? Or maybe another browser?
Since it's working for everyone else, it must be your computer is having issues with the new version. When all else fails, you can Google it to see if others had the same issue. AddonChat is the app.
I will try and figure out why the "users chatting" isnt working.