yes, it was the cause of the problem. the cloaking plugin hid my paypal addy and made the "add to cart" button load eternally.
thanks a million for making the free version of this available. it's exactly what i was looking for and works like a champ. i only have a few items for sale and a full blown cart was extreme overkill, but simple paypal buttons were clunky and caused too many page loads. i'll definitely be upgrading to the full version when the time comes to expand.