gustmf

I had already verified that. Editor was already checked.
Just to make sure I even tried to uncheck Editor and than check it again, to no use. The editor won’t show when editing the post.
I used the BETA feature to get the code that I reproduce here:

add_action('init', 'cptui_register_my_cpt');
function cptui_register_my_cpt() {
register_post_type('conteudo', array(
'label' => '__('Conteúdo')',
'description' => '',
'public' => 'true',
'show_ui' => 'true',
'show_in_menu' => 'true',
'capability_type' => 'post',
'hierarchical' => 'true',
'rewrite' => array('slug' => 'conteudo', 'with_front' => '1'),
'query_var' => 'true',
'has_archive\' => 'true',
'exclude_from_search' => 'false',
'menu_position' => '5',
'supports' => array(''title','editor','excerpt','revisions','thumbnail','author','page-attributes','),
taxonomies' => array(''category','post_tag','),
'labels' => 'array (
  'name' => 'Conteúdo',
  'singular_name' => 'Conteúdo',
  'menu_name' => 'Conteúdo',
  'add_new' => 'Add Conteúdo',
  'add_new_item' => 'Add New Conteúdo',
  'edit' => 'Edit',
  'edit_item' => 'Edit Conteúdo',
  'new_item' => 'New Conteúdo',
  'view' => 'View Conteúdo',
  'view_item' => 'View Conteúdo',
  'search_items' => 'Search Conteúdo',
  'not_found' => 'No Conteúdo Found',
  'not_found_in_trash' => 'No Conteúdo Found in Trash',
  'parent' => 'Parent Conteúdo',
)'
) ); }

[Moderator Note: Please post code & markup between backticks or use the code button. Your posted code may now have been permanently damaged by the forum’s parser.]

I’m not an WordPress expert, sorry if I don’t know the proper terms..
By “edition box” I mean the very basic area where you can see and edit the post text, be it in a [Visual] representation (what you actually see) or in [Text} representation (the html code). It includes buttons for changing character/paragraph features such as bold, italic, size, or for creating links, aligning text, cut/paste and so on…
They are working as expected for regular posts but not in CPT posts.

We have 2 CPT:

Action: Delete/Edit/Get Code; Name: conteudo; Label: Conteúdo; Public: true; Show UI: true; Hierarchical: true; Rewrite: true; Rewrite slug: conteudo; Total Published: 107; Total Drafts: 14; Supports: title, editor, excerpt, revisions, thumbnail, author, page-attributes

Action: Delete/Edit/Get Code; Name: cedoc; Label: Centro de Mídia; Public: true; Show UI: true; Hierarchical: false; Rewrite: true; Rewrite slug: cedoc; Total Published: 616; Total Drafts: 8; Supports: title, editor, excerpt, trackbacks, custom-fields, comments, revisions, thumbnail, author, page-attributes