[mst]

Hm, not sure... works fine over here. Are you on a fast connection? Smugmug downloads the higher resolution variant in the background after you clicked on an image. So, after a while (a very short while on a fast connection) yo should see the image in full detail.

If that doesn't work for you, you can also download all the images in full resolution. If you hover over an image with the mouse, there's a tiniy download icon in the bottom right of any image.