Aha, it looks like the HTTP "referer" is being checked and if it's Patreon (i.e. you came in from a Patreon webpage) then it causes the problem. Having no referer (using a command line downloader) or coming from another IMGUR page works.
This is IMGUR's problem, I hope it is a temporary mistake and not a permanent policy change on their part.
Todd Whitesel
2018-01-21 13:40:52 +0000 UTC
very strange, if you remove the .png from the URL the image will load, and then if you go back to the url with the .png extension the image loads. How strange.
LMSketch
2018-01-21 11:46:23 +0000 UTC
Patreon shows a "broken document" here in the post and imgur says the image can't be displayed because it has errors. :( Anyone else getting this?