Hi, yellow

Thanks for your reply. What you said is really right, it is the mistake from the template. I have just replaced the bad links with the zen_href_link() from tpl_categories.php. Now, everything is ok!

Another question is, when I setup the Paypal IPN return address, which one should I use: "https://www.shoesbuyonline.com/checkout_success" or "https://www.shoesbuyonline.com/index.php?main_page=checkout_process"?

Thanks for your time,