Analyse and resolve issue with Apache configuration

I am running a VPS which has a number of WordPress websites. It runs Centos with Apache 2.4.7 and PHP 2.4.7 with WHM/cPanel. I am getting two issues at the moment which I believe are related to the server configuration. 1. When I try to add a number of menu items to the WordPress menus the new menu items do not save. Similar to [login to view URL] 2. When I try and import data into WordPress using the XML import tool it returns a 500 error. Similar to [login to view URL] I'd like someone with a good knowledge of both WordPress and server configuration to take a look, resolve the problem and do a quick tuning of the server. I've tried increasing the WP Memory Limit, max_input_vars and some FCGI parameters and even switched from FCGI to suphp and the problem still persists.