OK after looking at this closer it seems to be either a side effect of directx or the mpeg2 codecs. I can see this line in mplayer classic and VLC, but open the same vob in vdub and no purple line! It's got to be some crappy filter thats being used by these progs. As a side note it isn't just PAL disks that are effected. My aotc disk is ntsc and it also produces this line in anything but vdub. I did make one observation which is weird, if you do a screen cap while in media player and paste it into a paint program the line has gone!!