So, the problem that is happening is that there is some type of a PHP error during tha AJAX request that ACF makes before the post is save (the AJAX request is done for validating of fields) This is why the update button continues to spin and nothing happens.
To figure out what’s causing the error turn on debugging and logging of errors, add this to wp-config.php or change what’s there to match this.
define('WP_DEBUG', true );
define('WP_DEBUG_DISPLAY', false);
define('WP_DEBUG_LOG', true);
Then go to a page and try to updated it. After a while look in the debug.log /wp-content/debug.log and see what errors are happening during the request.
If no errors are reported there then you’re looking for a JavaScript error instead.
In any case, you are looking for some type of a script error. If you can figure out where the error is happening then we might be able to figure out how to fix it.
