Thanks everyone for your patience with the forum outages over the past 24 hours.
The Discourse team (who built the underlying open source software that powers this forum) are working on diagnosing the problem.
I am in direct communication with their founders. I’ll let you know once we’re out of the woods.
In the meantime, if you need to, you can get a cached version of most forum pages by putting
http://webcache.googleusercontent.com/search?q=cache: at the beginning of the URL, like this: