We engaged in a 1 year agreement to formally support imgur, which also involved us getting 

- a dedicated server on premises with them
- a custom domain name

All our images should be accessible from both forms of the URL now, either `i.imgur.com` or `i.stack.imgur.com` .. such as:

https://i.sstatic.net/mPYaC.png

and


https://i.sstatic.net/VB5JX.png

Please note that we [retroactively replaced all forms][1] of `i.imgur.com` on the network from Aug 17 2010 onward, as a one time fix.

[1]: https://meta.stackexchange.com/questions/95732/images-manually-uploaded-to-imgur-are-not-displaying/95734#95734