The new format seems to have eliminated the ability to enlarge the photos to really really large. Is this true of all photos, or just certain ones? I enjoyed enlarging them to their fullest extend because so much detail is lost in the small size.
That feature has never existed and probably never will. However I am assuming you placed in manual HTML to display a large image. Or are you talking about the "enlarge" icon? Just click the image to view the image page. If it's about posting, I can explain how to insert large images (if that's what is at stake here).