Seems to be working fine on the pages I tested -- was there a specific product page having the problem? The most common explanation would be that the page in question is missing our View Cart code, as that carries the call to load box.js into the page.?
Also, if you've been testing with adding/deleting products in Admin and in a buyer cart from the same computer, sometimes that can confuse our cart-tracking cookie, so try deleting your browser cookies (or at least any identified with tonehammer.com and e-junkie.com) and see if that helps.
