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It only leaves your cart if you refresh the page while the other page turns to 'out of stock'

So my advice is to not refresh the page. Keep 2 tabs open. If you get the 'there was a problem' message...go to the other tab and refresh THAT page until its back.

Then head back to the cart and continue pressing, "proceed"

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it also takes the ajax roughly 3 seconds to run. So click every 3 seconds to ensure youre not cutting off a form submit that was going to take you to the ordering page.

also helps to have firebug open. It throws 3 posts. once they are done, hit the button again.

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