At one time I know attached images must have been different.
I was searching for something I had posted with images at one time, I don't recall if they were attachments or links, but they no longer render the same. The example I'm thinking of now shows only the thumbnails, for example.
But I've seen what appear to be very recent attachments of pictures, and clicking on them renders so poorly for me that I cannot glean any value from an attached image -- I can see it at 100% and the distortion removes its value.
When did these changes come into play? Are all old attachments now retro-hosed? Is there some kind of workaround? Am I the only victim? :)