I recently moved a working SunShop shopping cart (PHP, mySQL) from one host to another. Everything works fine except on checkout. When an order is submitted I get a page saying "Zend Optimizer not installed". To my knowledge Zend Optimizer IS installed. I don't think SunShop can run without it, and it runs good. The problem occurs only when trying to connect to a secure server for checkout. I entered the URL for a shared SSL as instructed by the new webhost same as I did for the old which worked for 2 years fine. Any ideas why it says "zend not installed" when connecting securely? I have since found that all other html and php pages work under https:// only the Sun Shop checkout page returns "Zend Optimizer not installed" Can someone fix this? I need it done as soon as possible.