[NullNix]

OK, so I tried making a custom recipe out of the Economist recipe. One failed, the other worked, still. Copied-and-pasted them into .recipe files (where they were still byte-for-byte identical, as expected) and both worked.

This is deeply bizarre! Does failure depend on the *name of the .recipe file* or something? (I mean, maybe it's a pure timing issue and the website is sometimes working and sometimes not, but I've tried dozens of times and this behaviour is perfectly consistent, so either I'm being astonishingly unlucky or there's a bug here that does not depend on the -- identical -- recipe content, and the only other thing that differs that I can see between the two recipes is their .recipe file name.)