It is so annoying! I've been trying all sorts of things, like going to the post directly and such, but nothing works. My last hope is that I have overlooked something in Tumblr's less than intuitive interface. I mean, I have a hard time believing that on a site so built around blogging images actually seeing them would be handled so poorly. When I post more than one picture myself I still do it in single posts, just so that the images don't get made tiny.