Yesterday, I received a comment telling me a lot of my pictures in my older posts were not showing up. I was glad to get that comment, honestly, because I really didn't know!
It was a simple but tedious fix and I believe I went through my first 10 rounds and got them all. As far as I clicked through, there didn't seem to be any more missing pics after that. But if any of you happen to come across a post with a picture which is not showing up and the problem is not fixed by doing a hard refresh (normally CTRL + F5), could you please leave a comment and let me know? I get notifications on any comment left in any post, so I'll definitely see your comment and be able to fix the picture(s).