In testing some changes to the backend part of the shopping cart I made a change on Tuesday that prevented you from getting to the cart itself (I was testing a popup notification). A kind customer notified me of the problem this morning and I have fixed it (no popups). One of the many reasons I shouldn't test on a live system, but it seemed a safe change (not!).
If you had a problem getting to the cart in the past 24 hours you should be ok now and hopefully the items you added are still in the cart. Please contact us if you run into any problems with it.