It might be a hardware issue. I'd return the burner and try another. I'm a regular poster/reader over on the main 1Click forum http://www.dvdrextreme.com/vb/index.php? and I have never read a post regarding a problem of vertical lines. A forum search over there only has one hit on vertical lines and that was in a thread about copying VHS tapes over to DVD. Probably a macrovision issue in that case.