WooCommerce product image error

Hi Guys

I’m setting up a new woocommerce shop and have most of the items sorted. However while the product images show peoperly on the shop, product and checkout pages, for some reason they do not show on the cart pages where they’re supposed to. http://www.littlebigbikes.com/cart/

Here is an screenshot of the cart page http://www.littlebigbikes.com/wp-content/uploads/2014/08/littlebig_cart.tiff

There is a blank space where the product image is supposed to go, and after inspecting the space in Firebug, it turns out that there is an image/link there, with the following wierd URL.

data:image/gif;base64,R0lGODdhAQABAPAAAP///wAAACwAAAAAAQABAEACAkQBADs=

The shop is currently hidden but here is a link to it: http://www.littlebigbikes.com/shop/

Any ideas how to remove this odd link and get the product images showing on the Cart page?

Thanks

Simon