[Cat Daddy]

I got a few dvd's from a trader that are really done well except for one thing. When I play them I can't jump forward to the next song or video clip.The discs do have the chapter/song listings as usual.
I'm using power dvd and this is only occuring with these few discs, other dvd's from several other traders work just fine when selecting chapters. Has anyone else had this sort of problem?