Author: mr.heat
Description:
I'm very, very sorry to say that but this stinkin' bug is driving me crazy.
Outdated garbage:
https://upload.wikimedia.org/wikipedia/commons/thumb/9/92/Schädel_und_Gebiss_einer_Großkatze.png/629px-Schädel_und_Gebiss_einer_Großkatze.png
Reported as bug 48927 and many, many others. See my comments at bug 31680 and bug 41130. It is always exactly the same problem (there may be multiple reasons but what I see as a user is always the same). I can reproduce this problem with almost every single file (re-)upload I do. Most thumbnails are purged but a random thumbnail size is not. Manual purge does not help. Sometimes the "hack" described in some of the other reports works, sometimes it does not.
I'm in Germany so please don't tell me this works for you.
Version: wmf-deployment
Severity: major