Blogger has lived up to its reputation of often being worth exactly what you pay for it (to be fair, it's skads better than it was a couple of years ago) by stating the the picture problem is "fixed." Of course, by "fixed" they mean that you have to go back to all of the affected posts and manually edit the machine generated photo link tags. I look at computer code all day, every day, so it's not that big of a deal to me, but I can't help but feel sorry for the Muggles.
Anyway, you can click on the pictures to see larger versions again, and rest assured that Google is heartrendingly sorry for any inconvenience this may have caused. Me? I absolve myself of all responsibility, as usual.