Hi sbillard, thanks for your response. I'm using version 1.3.1.2 [5831] (Official Build)
Am I interpreting you correctly that the expected behaviour is for the photo to reload, at the new size, immediately after the user selects the new size using the radio button?
I've got a test site up at
http://hughstimson.org/photos
if you'd like to have a look. I've tested it in IE9, Chrome8, FF3.6 and Safari5 and in all cases the page has to be manually reloaded before the image size changes.
Maybe I've configured something wrong on the back end?