Custompress: unable to select parent

I seem to be having trouble getting a custom post type to behave as a page. I have selected "page capabilities" and "hierarchical", and tried fiddling with the capabilities field (although not sure quite how that works). Now when I add new posts of the custom type I get the box which says select parent, but the dropdown only shows "main", not any of the custom type test "pages" I created. Any ideas? Thanks.