Re: Vertical green lines when playing DVDs
The most likely reason why a 2nd instance of xine plays normally is because its falling back to software rendering, since you are already using xv on the first output.
You say that you've seen this problem with mplayer as well? I'd like to see mplayer's output when you're running it and this problem is present.
Also, is this problem only present when playing DVDs, or playing any content with mplayer, xine, etc?