Quick follow up. I've fixed it. It turns out Cloudflare (which I've been using for some time) has changed how they cache our forums and it for some reason renders the chatbox unusable. Putting Cloudflare into development mode or purging the cache had no effect. I had to disable it entirely.
They're still my DNS but my site isn't being accelerated by them anymore. It's all working fine again. Hope this helps anyone else with the same problem.
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