FiMFiction just went through a major update of their underlying code, it's possible that some of the features and APIs that FFDL made use of changed or broke a bit. Here's the news post from the day of the big update
. The big surge of site-breaking bugs seems to have passed now so I'm sure bug reports on more subtle problems that might be interfering with FFDL would receive attention. Knightly
is probably the guy to talk to.
Possibly on a related note, I found two stories that aren't downloading correctly: Honey Pie
(error message: "Error downloading Chapter: http://www.fimfiction.net/story/68507/2/honey-pie/test
! Missing required element!") and Then Everyone was an Alicorn
(error message: "Error downloading Chapter: http://www.fimfiction.net/story/6427.../i-was-serious
! Missing required element!"). Both of these appear to be referring to chapters that aren't visible in the stories' chapter lists. One of the major bugs that appeared when the site was upgraded was "unpublished" chapters becoming visible to readers (the site lets authors hide chapters from public view) so I'd bet bits to bagels that the site's leaking references to unpublished chapters to FFDL and then refusing to let FFDL download them.
Edit: Oh, almost forgot, I wanted to thank you for pointing out the "don't process images" flag a little while back. I've got my lossy compression OCD all nice and satisifed now with fresh new cover images and illustrations. Thanks!