im having the same thing with a site im trying to setup. I upload an image, and the radio buttons are greyed out for thumbnail, med etc. Only original size is available. Absolutly doing my head in now, been looking for a solution for over a week.
Looking at using Pixelpost now, since this common issue has such little concern to some folk!
I am having this same problem on my blog and a freshly setup blog. The radio buttons for Thumbnail, Medium, etc are greyed out? Must of changed after the upgrade? Anyone provide a solution yet?!
