New Marketpress - Checkout does not work

I have a multisite version of WP setup and I had the Lite version installed and it was working ok. I disabled the Lite version and deleted in the plugin in the network admin. I then purchased and installed Multisite. Everything looks good and I enabled the PayPal Express checkout.

Now when I add products the sidebar widget only shows one at a time and when I check out is says there are no items in my cart.

HELP!