Trust me, I know this was a common issue and i know the main things that usually cause this but i believe I have something else going on here.
It does not happen all the time but occasionally I will see that someone has uploaded an image and instead of the image I see a link to the attachment with the attachment id number like Attachment 11938 for example. The link is always broken. It has happened to me as well.
The image appears to upload properly and I can see it inside the post but after saving I will sometimes see the link and not the image.
My settings are to display inline images.
What is making this hard to troubleshoot is that it only happens on occasion and I cannot really see anything particular about the images it happens to. I first thought it was perhaps the size but that does not seem to be the problem.
What do you guys think this could be?
--------------- Added 31 Aug 2016 at 13:23 ---------------
I thought this could be a Cloudflare issue but I have no idea how to test this theory because this happens so sporadically.