eXtplorer - PHP-based File Manager

I get a blank screen (except for the header) after logging in successfully in extplorer using only FTP authentication in stand-alone mode.

This appears to only happen on newer operating systems. I get a blank screen in Ubuntu 14.04 with my web server software setup exactly as it is in Ubuntu 12.04.

In Ubuntu 12.04, extplorer using FTP authentication works, and I am able to upload & modify files.

In Ubuntu 14.04, extplorer successfully logs in using FTP authentication, but then I get a blank screen (except for the header) without being able to interact with any of my files.

Attached is my config and a screenshot. The latest extplorer is unusable using FTP authentication as stand-alone software on Ubuntu 14.04.