The plugin crashed for me after having updated it to the latest version on the latest WordPress. I then deactivated and then reactivated it, as suggest here on the forum by others. But it didn't help.
I've now downgraded it, it didn't help either. It changed my file permissions for "wp-content" I get these errors.
W3 Total Cache Error
Unfortunately we're not able to create folders and files or write to them to complete the installation for you automatically. Please enter FTP details below to complete the setup.
Database caching is not available: /home/x/public_html/wp-content/db.php is not installed.
Object caching is not available: /home/x/public_html/wp-content/object-cache.php is not installed.
Object caching will not function properly: /home/x/public_html/wp-content/object-cache.php is not latest version.
Page caching is not available: /home/x/public_html/wp-content/advanced-cache.php is not installed.
Either the /home/x/public_html/wp-content directory is not write-able or another caching plugin is installed.This error message will automatically disappear once the change is successfully made.