category_view only works on categories? (not containers?)

I have this simple setup:

- a custom node (with CCK): "useful link"
- a container: "useful links"
- 2 categories for this container: "for families", "for children"

- The container is assigned to the custom node "useful link", so that when a user creates one, he can choose the category the link should go to.
- A link can be assigned to multiple categories, but at least one is required.
- I have assigned the depth of the container to -1, so that all links are displayed on the container.

It works fine. I can add a link, choose its category ("for family" or "for children"), and it will be displayed on the "useful links" page (the container).

Now I would like to add a view to that container, so that I can have an exposed filter, enabling the user to filter by category.

I create the view, add it to category_view for that container, but then the container page doesn't display the nodes anymore.

The view itself work fine on the category pages ("for children" and "for family"), so the problem doesn't come from that.

Any idea?