But it was before ant update. I just changed an option in a dropdown custom field. I replaced a name by another. Now all fields from this custom post type are empty. I can create new post but only add title. And if I try to update an existing post it doesn't work. Like if it is only readable.
The fields data appears correctly in the admin columns on view all posts page. But when I open a post all fields are empty.
I updated to last version of metabox and wordpress without result.