We've had this problem since forever, and I thought it was just due to a missing JS script or such, but according to this page the fault could lie in LocalSettings.php. But I don't know where to start with editing this script or if I even have the right to access it. Please confirm whether the issue is with LocalSettings.php, and how it can be resolved. Thank you!--~~~~
Topic on Project:Support desk
To clarify, I'm talking about images uploaded directly to arywiki, not images from Commons for which thumbnailing works without any issues.-~~~~
Weird. They are giving 403 errors. This is definitely a misconfiguration on Wikimedia's end. This is a pretty big issue so i suspect it will be looked into rather quickly.
I have forwarded this report to phabricator at https://phabricator.wikimedia.org/T326309 . There should hopefully be some sort of update there in the next few days.
Thanks for reporting this via Phabricator; it's now fixed.