I have a bunch of code that I wrote that works fine on my Windows 8 machine running Zend Server 6 CE over IIS. When I load the same code onto my CentOS 6 Zend Server CE 6 the grid does not load the data even though permissions are 777. Both servers are running PHP 5.4 and I have checked the database privileges many times and have verified that XML data is coming through as a return from the post with no errors or warnings. There is valid XML coming through as I see the response in Firebug but the grid does not load its data.