I am new to zen cart. Well I don't use it, but I have picked up a site to host that uses zen cart. They have a pay pal express check out button on their site once you add items to the shopping cart. That button has stopped functioning. I have looked everywhere I think there could be issues, but again I'm not familar with the zen cart interface and I didn't build this site. What information do all you smart zen cart folks need to help me with this issue?

I can tell you now that when you click on the button it goes to a 500 internal server error message, but I have called tech on the server and there should be any issues there. What are some issues that might cause this?

Thanks to any and all that can help.