I am having trouble with the sort order on some products.

I am not using attributes, just a product with 3 images.
Base image name is WCUFDRIVE.jpg and additional images are WCUFDRIVE_1.jpg and WCUFDRIVE_2.jpg.

All 3 have sort order set to 0.

When I load the page the WCUFDRIVE_2.jpg image is being shown in the medium image container.
You can see an example on this page. Remove the spaces in the url to make the link work.
http://www.e x c i t e d 2 l e a r n.com/shop/index.php?main_page=product_info&cPath=66&products_id=185


I am also having trouble getting this mod to work at all in IE7. All I see is the loading indicator gif, but nothing ever loads. This happens on my site as well as the webextremecustomiser example site.

Any help would be greatly appreciated. I am just about ready to go live with this site and was doing a cross browser check when I noticed this issue.