Customizer isn't Working
To make sure the settings are right go to Settings > Reading > “Latest Posts”. If it was set to “static” then that is most likely the issue.
If not, then you would want to check for a plugin conflict.
If that still does not fix the issue, it could be on the hosting end.
You could try fixing your wp-config.php
file.
Look for the following and then change the URL appropriately:
define(‘WP_HOME’,’http://YourSite.com’); define(‘WP_SITEURL’,’http://YourSite.com’);
In the event your file looks like this, you would add the “www” to the URL. It would then look like “http://www.YourSite.com”