I have the same problem with a client's website. Once the plugin is disabled, the site works fine.
This is the error I found in the logs: PHP Warning: gzencode(): stream error in /usr/home/berkley9/www/htdocs/wp-content/plugins/w3-total-cache/lib/W3/PgCache.php on line 902. I guess it has something to do with Gzip...
A couple of notes:
- The site works if I am logged into WordPress when I access it;
- The site also works (in an Incognito window in Chrome) on my local installation of the same site