I have used Portfolio Press for some time now for my personal portfolio. I was going through the site today and noticed that all the links for Portfolio Categories are broken. This was the case before and after I updated to Portfolio Press 1.5. I'm not sure how long things have been like this.
I originally created my menu the way we're shown to in the tutorial video, and nothing has changed. Everything seems to be set up correctly in the administration area.
I do have a child theme making a few style changes to the main theme, but I tried deactivating it and simply turning on Portfolio Press by itself, and this did not resolve the issue.