Yep, today that's what we have. Refreshing the page does work, on some forum pages, but not on all of them. I wasn't sure it wasn't just a location-dependent problem, but you guys confirm that it's affecting others.
Probably a server issue. IIRC, the http server is nginx, and frankly I've witnessed recurring issues with nginx compared to Apache. Not meant to be a flamewar of any kind, just a note. I personally would not use nginx as a http server. Just too finicky IMHE. Maybe it has nothing to do with nginx this time though, so in this case, consider it just a random rant.