I'm experiencing it, too.
Just tried uploading an image via the new, built-in image uploader and it's not displaying.
Page source reveals the image URL as
https://cimg1.ibsrv.net/gimg/www.fly...5fb34a4410.jpg. Clicking that results in this:
Error 500 Ray ID: 40c86576cdee7aca • 2018-04-16 17:33:19 UTC
Internal server error
You
Browser
Working
Kansas City
Cloudflare
Error
cimg1.ibsrv.net
Host
Working
What happened?
There is an internal server error on Cloudflare's network.
What can I do?
Please try again in a few minutes.
Cloudflare Ray ID:
40c86576cdee7aca • Your IP: 38.131.218.243 • Performance & security by
Cloudflare
Of course, it's somewhat ironic that I was able to paste the image above and have it successfully display here.