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  • To verify if you have the same cause of this problem as me:

    • go to the ‘edit page’ screen
    • open your browser’s developer console
    • in the HTML of the page, search for ‘_acf_nonce’

    If it’s not present, you can try to following stop gap fix, which seems to have worked for me:

    Edit wp-content/plugins/advanced-custom-fields-pro/includes/forms/form-post.php and in the function save_post($post_id, $post) comment out the following three lines:

    if( !acf_verify_nonce('post') ) {
        return $post_id;

    Warning: I’m not entirely sure what function nonce plays in ACF, or whether it’s lack is part of a larger bug. Use this workaround at your own risk.