Which URLs give errors?
In the screenshot I see a Pusher error. It's likely unrelated, but you should fix it or disable Pusher to make sure it's not linked.
I also see a 403 error getting a discussion. Is it the discussion ID for the broken discussion, or is it a different discussion? It's odd for the page to render if the discussion returns 403 in the API.
Are there other errors in the network tab of the browser?