Paypal Express not working after upgrade from ipn

After having problems with Paypal ipn orders not showing up in my admin, I upgraded to Paypal Express Checkout. It does not seem to be working when I tested it. I get the following message after signing in to my paypal account to place an order - At this time, we are unable to process your request. Please return to "MY WEBSTITE NAME" and try another option. I searched the forums, but couldn't find the answer. I am using version v1.3.9h. Any help would be greatly appreciated!

Sounds like it's not configured properly.

See www.zen-cart.com/getpaypal

If it's still a problem after properly configuring it, enable the debug logs and report back with what they contain. http://www.zen-cart.com/forum/showthread.php?t=61199

It seems to be working now after reconfiguring. Many thanks!

Thanks for confirming that using the correct configuration settings resolved the problem.