I installed W3 Total Cache on the WordPress website and it caused the Simple PayPal Shopping Cart to not work properly. When W3 was installed, PayPal begin doing all sorts of weird things like displaying the wrong pricing, not adding items to the cart and replacing deleted items with random new ones. Deactivating W3 returned everything to normal.
Are there some settings in W3 that need to be addressed so that it doesn’t affect PayPal?