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.
