I use infinite scroll on my blog archive page (Blog | An Infinite Number of Monkeys). I just noticed that it’s no longer working. Nothing has changed about the page for a long time, the only recent change is upgrading to 1.9.9.
When the new page tries to load after scrolling to the bottom, it starts to give a whole bunch (endless in fact) 401 errors:
I don’t use any caching plugins on this site. There’s full page caching provided by Cloudflare, but I’ve cleared that to no effect.