Hey rob, if you follow the boonex installation there are some php files they state to be 666 and I believe /inc/header.inc.php is one. There are a few others that need to be in ray for your changes you make in your admin panel/ray to be able to write to them. A few others they state 666 which again could be debatable depending on hosting type. There are a few 777 folders in order to upload files. This could vary by hosting type. Your host might only need 755 in order upload. 777 can cause some security see more issues, and it is not recommened unless a script actually needs it for your type of hosting. Most often if php is apache module then a 777 would be required for upload. If php as cgi you might only need 755 or even less.