PayPal PAyment Pro

We are using Paypal Payment Pro on our website and have intermittent problems with the payment window not appearing to resolve. The Working Icon continues to spin but never resolve even though the payment is processed by Paypal. Customer usually give up, close the window and start again, which of course processes a second invoice and payment. PayPal claims that this is not their issue. Can anyone shed light on this problem???

Ron

We're experiencing this same problem. I assumed it was PayPal's processing servers getting bogged down; we contacted our PayPal merchant account manager, but they think it's OpenCart's problem, of course.