unable to use og_menu as anyone other than user 1

og_menu appears to be completely broken, except while logged in as user 1. For all other administrators, whether local accounts or LDAP accounts, it is non-functional. For example:

As user 1 on a fresh Drupal (7.10, "standard" profile) install, the following test works as expected:

1. Enable og_menu and all dependencies
2. Create a new content type, of type "Group"
3. Edit a menu, and choose the group from the "Enable this menu for the following group" drop-down

As any other (administrator) user, however, the drop-down menu is empty and there are two "Notice" errors:

    *  Notice: Undefined property: OgGroup::$tid in og_menu_form_menu_edit_menu_alter() (line 361 of /srv/drupal/7/sites/all/modules/og_menu/og_menu.module).
    * Notice: Undefined property: OgGroup::$title in og_menu_form_menu_edit_menu_alter() (line 361 of /srv/drupal/7/sites/all/modules/og_menu/og_menu.module).

The administrator role has the "Administer Organic groups permissions" permission, and I'm subscribed to the group as the other admin user.

Am I missing something, or was this module really never tested as another admin, other than user 1? I have also tested this in 7.x-2.x-dev, with the same results.