Update 11/01/18: Some Flickr accounts may also be affected. See this post for details.
Photobucket just decided to charge $400/year to host your images. If you have anything uploaded and embedded there your images will no longer show up. You will need to re-upload and re-link from a different image host.
Personally, I need to redo all GIFs on my TRs now. (My images are hosted on Flickr, but my GIFs are on Photobucket.)
Of course the question is how do we know that your new host will not pull the same trick next week... Maybe it's time to have TR pictures hosted on the DDF side.
Mods - it seems that we'd need a mechanism for users to edit their old TR posts; I know I do. Maybe some sort of temporary permissions on a thread by thread basis.