Just picked up my copy of Ulysses 31 from HMV today and seem to have run into a bit of a problem. When I put the disc into my PC and hit play it starts off part way through the 3rd episode (The Black Sphere). There are no menus and no way to skip to previous or later episodes. Skipping forward or back just results in PowerDVD stopping playback altogether. Do I have a duff disc or is there some magical way to get menus to appear?