I posted about this a week ago and thought I had it resolved, but it is no longer working.
I'm trying to display a list of pages that are in BOTH a category with a slug of "bio" AND a category with a slug of "degrees".
When I set up the View, I set it to query Pages, then I set the query filter to query Categories. I then set the taxonomy to Value set by View shortcode attribute.
I set the value to taxonomy slug, the shortcode attribute to "category", and the operator to "AND." I get no items to show up. When I set the operator to "IN", it works as expected, but I need the posts that are in both categories.
Any more suggestions?