I assume this is something to do with the big HTTPS change ...
Just now I was fixing up some broken images on meta sites by changing http to https. Many of these were on pro-tem mod nominations, which often include the main-site, meta-site, and network flairs of the nominee. But for some reason, the meta-site flairs aren't working.
https://scifi.stackexchange.com/users/flair/31394.png works to give this image:
https://scifi.meta.stackexchange.com/users/flair/31394.png doesn't display an image at all:
(In case anyone else isn't seeing the same error, here is what I see for this post.)
I've also tried
http://meta.scifi.stackexchange.com/users/flair/31394.png (gives the now-usual "must use HTTPS" error) and
https://scifi.meta.stackexchange.com/users/flair/31394.png (doesn't work at all, or at least gives the same non-functioning image as meta.scifi).