Some server configurations do not permit the wp-config.php file to be set to 660, it will result in the site becoming in accessible. If this is the case in your situation, change the permissions to 664 and this should resolve the issue (It adds the “read” permission back for guests).
The Yoast SEO version 4.3 plugin conflicts with RocketTheme’s RokBox 2.50.7 on WordPress 4.7.2
The Yoast SEO plugin installs without error and sets up correctly, however, when you go to use the “Readability” or “Analysis” features they do not respond. Additionally, all posts will state that the Readability feature and the SEO are “Not Available”.
This is expected to occur in any WordPress site where a RocketTheme template is in use since the RokBox plugin is a standard feature in many of its available templates.
Disabling the RokBox plugin will allow Yoast SEO to work properly.
Installing or upgrading to WordPress 4.4.2 on Apache results in a blank screen.
After installing WordPress 4.4.2 on an Apache Server, the screen displays a blank screen. If you check the Apache server error logs you will see the following: PHP Parse error: syntax error, unexpected ‘[‘ in /var/www/vhosts/”Your Site”/wp-content/install.php on line 66.
You are running an incompatible version of PHP, the server PHP level should be at PHP 5.6 or higher. This is required in order to run WordPress 4.4.2, to resolve this issue upgrade your server’s PHP to the latest version. This should be done anyway for security reasons.