Hi Matt,
The problem is previously you might use this code to register meta boxes:
add_action( 'admin_init', 'prefix_register' );
function prefix_register() {
// Some code here
}
Or something like this:
if ( is_admin() ) {
add_action( 'rwmb_meta_boxes', 'prefix_register' );
function prefix_register( $meta_boxes ) {
// Some code here
}
}
It's required to switch to simpler syntax like this:
add_action( 'rwmb_meta_boxes', 'prefix_register' );
function prefix_register( $meta_boxes ) {
// Some code here
}
in order to make the rwmb_meta
work.