After converting the DVD "American gangster" to a single vob file there are problems playing this file in all players I tried (MS MediaPlayer, PowerDVD, DVBViewer ...). The problem is that after a certain time (some minutes) the movie suddenly freezes and after a few seconds jumps some minutes forward (so I miss some parts of the movie). As well the language is sometimes just english even I wanted the german track to be converted ... Sometimes in another section of the movie the audio is out of synch. I used the most actual versions of AnyDVD and CloneDVDmobile. Any idea what might be wrong?