Postimage links made before mid April need the link changed to the .cc to get images back in business. So basically edit your post and on your image link change the .org to .cc. then save. Your image links will work now.
Your pictures are still there, but any pics links you posted you have to change the .org in the link to .cc to get them to show again.
example:
Change this:
https://s5.postimg.org/fal7wrdjb/100_3333.jpg
to this:
https://s5.postimg.cc/fal7wrdjb/100_3333.jpg
I changed all my Postimage links and they all work now, yes a pain but it was simple. Postimage automatically changed all the picture links to cc on their site, now you need to change all your posts. If you don't do this your links will not work.
cc appears to be a permanent fix
Rob