Regular category taxonomies not finding custom post type

Hi. I have created a custom post type in CustomPress, and have set the option in that custom post type to Support Regular Taxonomies for categories. When I edit on of those custom posts, the regular categories appear, and I can select them.

But when I go to the category page for that category, none of the custom post types show up.

Settings for the custom post type are as follows:

Post Type: opinions

Supports: Title, Editor, Author, Thumbnail, Excerpt, Comments, Revisions

Support Regular Taxonomies: Categories

Capability Type: post

Map Meta Capabilities: True

Custom Fields: This post type does not use any Custom Fields

Public: True

Show UI: True

Show in Nav Menus: True

Publicly Queryable: True

Exclude from Search: False

Hierarchal: False

Has Archive: True (Custom Slug blank)

Rewrite: True (All options blank)

EP Mask: EP_NONE

Query Var: True

Can Export: True