Thread:Project:Support desk/Special:SpecialPages returns a 500 server error

I cannot get SpecialPages to work. I did a clean install on a different server with the same results. It's NOT an IIS issue as this is running on an Apache server running Linux.

Check it out if you like: http://www.actioncoachtest.com/mediawikitest

Firefox simply returns a blank page. IE returns a 500 Server Error when clicking on SpecialPages.

I'm using mediawiki 1.18.1 PHP 5.2.17

http://actioncoachtest.com/mediawikitest/phpinfo.php