First off, everything burned fine the first two dvd's I made. The problem came when I noticed jittery motion whenever I played the dvd in dvd players. I went back in and experimented with the transcoding settings and tried progressive etc. When I went to burn, Encore told the me the brand new disc (verbatim DVD-R) was not blank, and when I click to overwrite an error message pops up ("unknown"). I went back and switched all the settings back to where they were, now the same thing comes up when I try to burn. Can anyone help? Thanks.