Missing APS package icons and screenshots

After a clean ISPConfig 3.0.5.1 installation on Debian 6 with NGINX and PHP-FPM. In package details pages icons and screenshots are missing.

Broken URL's are like this;

****/sites/aps_packagedetails_show.php/sites/aps_meta_packages/WordPress-3.5.1-1.app.zip/icon.png