Checkout button stopped working

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Please help! My checkout button stopped working. I tested it yesterday and was able to enter my cc info to get it to go thru a complete transaction. Today it is not working. I click it and nothing happens. When I click to x out of the checkout box, an oversized buffer wheel starts turning in the  middle of the screen. What did I do to this thing!?! I added several apps today....did I mess something up?