I've just updated to 3.5. I updated some plug-ins as well. When I try to log in administratively, I get this message:
W3 Total Cache Error: some files appear to be missing or out of place. Please re-install plugin or remove /services/webpages/v/e/velosoul.com/public/wordpress/wp-content/advanced-cache.php.
I can't log in to make the change noted above or to do anything at all to my website.