Well, that's odd. If i force the image to open in a new tab instead of a new window then the image initially looks reasonable, but as soon as I zoom in or hit refresh in the tab, it goes south.
I noticed previously that there is a distinct render difference half way in the image, see attached. I wouldn't be surprised if the problem is the size of the image in combination with the graphics card. (NVIDIA GeForce 9400M 256 MB).