I have imported some portals from one install to another and am trying to change the container skin.  When I set the container to "site default" it tries to load the old container skin instead of the default site container.  If I choose a container, it works, but if I go back and choose "site default" again, it tries to use the container from the old site.  I haven't scoured the database for any trace of the old container but can't find it.  Where else would this information be stored?