"There are no items in your cart" has to deal directly with ubercart. Anonymous users on all other browsers are able to add items to their cart.

Here is where I think the problem is SOMEHOW related to cart links. If you go to www.davianletter.com/tdl/subscribe/tdl-level-1 you are able to add the Level 1 item to your cart. This page DOES NOT use cart links. If you use the subscribe page, which uses cart links, it gives you there "There are no items in your cart" error.

Any ideas on how cart links could cause this? or how cart links could not work with ie6?