Unfortunately when an image doesn't fully load it's often an indication that the image is corrupt. However, if that was the case I'd assume that it wouldn't be printing the full image either. Try saving the image files to the hard disk drive and open the images from there.
If that doesn't work, what are the image extensions (e.g. .GIF, .JPG)? What are you using to open the pictures? Could you post an example image on the forums?