Collections not showing in Apps menu

Hello,

Collections are not showing in the Apps menu for some non-admin users.

For each collection, under options, the "Include in app menu" checkbox is checked, the corresponding role is checked under "Permissions" ("May be edited by"). Is there anything else I should check under the "Users" > "Roles" page?

Here is the diagnostic report:

Perch Runway: 2.8.26, PHP: 5.6.17, MySQL: 5.1.73, with PDO
Server OS: Linux, fpm-fcgi
Installed apps: content (2.8.26), assets (2.8.26), categories (2.8.26), collection_2 (2.8.26), perch_forms (1.8.3), collection_5 (2.8.26), perch_members (1.4.2), perch_backup (1.2)
App runtimes: <?php $apps_list = array( 'content', 'categories', 'perch_members', 'perch_forms' );
PERCH_LOGINPATH: /cms
PERCH_PATH: /home/planetechq/www/cms
PERCH_CORE: /home/planetechq/www/cms/core
PERCH_RESFILEPATH: /home/planetechq/www/cms/resources
Image manipulation: GD
PHP limits: Max upload 64M, Max POST 64M, Memory: 512M, Total max file upload: 64M
F1: 2edba60ed1f613d6dd804feb202456a2
Resource folder writeable: Yes
HTTP_HOST: planete-carlin.paris
DOCUMENT_ROOT: /home/planetechq/www
REQUEST_URI: /cms/core/settings/diagnostics/
SCRIPT_NAME: /cms/core/settings/diagnostics/index.php

Thank you.