MarketPress and WP Super Cache problems


I seem to have ongoing issues with WP Super Cache and MarketPress.

My dev has created a brief screen-cast that shows the problem:

It shows how if you go back to the products page the count is still 0 from the first time you visited it, then back on the cart page it’s fine, then back on the products page it’s zero, but goes up because of my javascript when something is added to the cart.

the next time the page is loaded, it should get the count from the cart data but it doesn’t when cached.