MarketPress and PayPal flow

I updated my MarktPress plugin and now I get this problem.

1. The user is directed to PayPal to complete their payment.

2. User inputs credit card info into PayPal screen.

3. Then – instead of processing payment and being done — the user is directed back to the checkout page on my site. If they do not hit “Submit Order” on my site, the payment never goes through

PayPal looked into the issue and determined the cause being —

“Upon checking the logs, the redirect URL being passed in your code is “”. Please update the code with the correct return URL.”

Can you help me with this?