One day you wash up on the beach, wet and naked. Another day you wash back out. In between, the scenery changes constantly.
The photos show up just one at a time when you click on one, they used to show up as thumbnails on the bottom of the new page, full sized on top and linked. Any chance you reset that on blogger?
This appears to have happened on every blogger/blogspot site, so it would seem it's a google thing, not a site owner/user thing.
It was a setting the blog owner did.
I noticed the change a few days ago. I didn't change anything in the settings, at least as far as I know, but if you go back to some older posts it still works the old way. Blogger/google may have changed the way images are coded. If I compare the codes I might be able to figure it out.Until then, this is a first world problem.
It seems to have fixed itself. I'll hazard a guess that a lot of people complained to blogger.