I have used dvdshrink many times withou trouble, but now i get the message that there is a invalid navigation structure. I can play the DVD in a settop without problem, the dvd is aleready ripped. When I make a copy to HD and burn with NERO it cannot be played in a normal dvd-player. I have ripped it with dvddecrypter the same result, cannot be read in dvdshrink. Must I use IFOEDIT to arrange the structure?? Can somebody help me??