Why did I get a blank page after a Wordpress automatic update?
If you are using Falcon caching and your hosting provider automatically updates your Wordpress installations (like iPage or Dreamhost for example) this may apply to you. We have had one user report that after an automatic upgrade to WP version 4.0.1, the site's main page was blank. Before you do anything, try clearing the cache on the Performance Setup page. This is by far not a widespread problem but as it solved this user's problem we wanted to provide the solution here.