Access control for amazon item import

I have Amazon Tools up & running fine on a Drupal 4.6.5 site. But I'm having a problem with access control -- I've created several user roles, who I don't want to be able to use the "amazon item import" feature. But any user with rights to that role sees the feature in their 'administer' menu, and can search and import books.

The amazon rights for those roles are definitely unchecked, but it doesn't work. The default roles (anonymous user and authenticated user) can't see the menu item, so it works for them, just not the roles I've added.

Am I doing something wrong, or is this a bug? I do have the taxonomy_access module installed as well, but that shouldn't make any difference, should it?

Many thanks,
Arvana