It might be the same issue I had before and here is the solution I used (last post):
http://www.ubercart.org/forum/support/2616/images_not_showing

It is trying to find the image here if you look at the source:
http://www.esteliny.com/files/imagecache/product/files/D22766_A_1.jpeg

You probably just need to add "product" to preset namespace in image cache. Once you do that it should work.