Hello,

There is maybe a bug with the “New” attribut when you create a metabox.
For instance, when I use this code to add a metabox + text field in my Custom Post “cadeau” :

<?php
/*
Title: Prix
Description: Prix du cadeau en euros
Post Type: cadeau
Capability: administrator
Context: normal
Priority: high
Order: 1
Locked: true
Collapse: false
New: true
*/

piklist( 'field', 
	array(
		'type'        => 'text',
		'scope'       => 'post_meta',
		'field'       => 'wptech_cadeau_prix',
		'label'       => __( 'Prix' , 'texdomain' ),
		'description' => __( 'Maximum 150 €' , 'texdomain' ),
		'help' 		  => __( 'Prix du cadeau en euros. Indiquer uniquement un chiffre.' , 'texdomain' ),
		'attributes'  => array(
			'class' => 'wpatech-cadeau-prix'		),
		'position'    => 'wrap'
		)
);

The metabox doesn’t display in my CPT “cadeau” (whatever the value is true or false). If I remove the “New” attribut from the comment, my metabox appears.