I had the Smart Payments trial installed and working, but suddenly customers have told me they can't checkout with PayPal. On my site, the payment option displays fine and opens the modal, but the spinning progress indicator never goes away. In Developer Tools I was able to see a 400 error invaild sdk meta. I thought maybe the trial expired (even though I am nowhere near the trial limit yet) so I paid and entered my license and restarted nop, but it still occurs. Any ideas?