On the creativia demo you are using the K2 and metafizzy (WS-Portfolio module??)
I created K2 items with categories and additional info, and a menu item that linked to categories, and that worked.
In the WS-Portfolio module, they use the module, with the loadposition keyword inside a single article, and manage the content within their module config.
Can I manage K2 items with the WS Portfolio module ? I thought that this is what you did in the creativia demo. Maybe this is a question for the module manager