I was facing with same issue during update to 0.9 (seems is beta) and receive blank screen of death.
A good practice to locate problems try to setup WP_DEBUG into wp-config.php
define('WP_DEBUG', true );
Problem was located into /var/www/xxx/wp-content/plugins/w3-total-cache/lib/W3/Plugin/TotalCache.php when try to using DOMDocument
at line:
$dom = new DOMDocument();
That seems was missing on my production server and from here was the fun begin.
I suggest as required modules to be checked when plugin is installed and be sure all requirements are accomplish.
Happy caching!
