I have lots of images in the Media Library (ML) and all of them have proper sizes, including thumb, large, full. But in ML, WordPress simply display the FULL size of the images instead of using a much much smaller thumbnail. There are people talking about the "problem" and some mentioned it was due to the theme. I switched to default theme and disabled all the plugins (latest WP 3.6), the problem still. ML is slow and it's a pain to use. Any way to solve the problem?