Well I am not the vbgallery guru here so I will let Josh respond but your issue seems centered around your import thing and not specifically the product itself.
The files are like that on my test site?
http://omegatron.net/gallery/showimage.php?i=1&catid=3 http://www.omegatron.net/gallery/fil...nterLeaves.jpg
More than likely once you get all the main images showing you need to rebuild your thumbnails. You sure your import worked correctly? Is the filename correct in the filename field in the database?