Paypal Express Problem - Loop within checkout (buyers aren't trasnferred to Paypal)

Hi.

My customers are getting stuck in a loop within the checkout when using Paypal Express.

At Stage 3 of checkout (final confirmation), they are looped back to Stage 1 (shipping).

I have patched the latest stuff and it's still a problem.

I have recently upgraded to the newest version.

Any ideas?

Thanks, Matt.

Have you check on the latest patch for PayPal based on new changes that PayPal has made at:
http://www.zen-cart.com/forum/showthread.php?t=56216

Matt,

Can you turn on debug logging and post the debug logs for analysis?
They'll be generated in the /includes/modules/payment/paypal/logs folder (you'll need to make sure it's set to allow read+write permissions before they can be saved)
Debug settings can be selected within the Admin ... where you entered your PayPal information.