Sometimes, when I compress Quick Time Movies to Mpeg with the Compression Master(4.0) , It creates a green vertical line on the movie, that only appears on Windows Media Player, on quick time player it goes well.
Sounds like an issue with whatever WMP is using to decode the MPEG-2. (As Windows relies on 3rd party software to do the job.)
If you can't see it in Quicktime then I'd assume it's not a problem with the video file itself.
Actually It is MPEG1 and my biggest problem is that this files are for "normal" people, that kind of user that doesn't even know the difference between a MPEG or a QT File. So it's hard to say this people to use something different from WMP. :(
Sorry I assumed it was MPEG-2, It's rare to see an MPEG-1 these days.
What I was trying to say was that if you can't see the green line using Quicktime and you can see it with Windows media player, try and see if you can see it using VLC.
If you can't see it using VLC then it's a problem with that particular Windows Media Player and as such all the 'normal' people are unlikely to see the green line.