… I upgraded the forum software a few days ago, and noticed none of you were chatting much - little did I know, the new version of discourse broke certain reverse-proxy configurations for a lot of people (Eg. https://meta.discourse.org/t/help-cannot-login-error-shows-bad-csrf/52424 ) including us.
The symptoms were an apparently working site, that was unable to validate any kind of POST request from logged-in browser sessions, and an inability to login from scratch.
Thanks for your continued patience…