I have recently finished a 50 minute piece in Premiere. Now I upgraded my computer from CS3 to CS4, and continuing my work in CS4 (But I know for sure that this isn't the cause for the problem).
The problem is that sections where pre-rendered footage (From Premiere) with titles and some simple colour corrections, there is intermittent green jittering lines at the bottom of the frame and some of the titles were having a similar effect when played back in Encore.
I had this exact problem on a previous project, which was done entirely in CS3, but I chose to ignore it and the green jitters appeared in the final product.
Now I have watched the Encore transcoded footage in VLC and it appears perfect, no green jitters to been seen.
Is this to say that Encore is somehow re-analyzing a DVD compliant file during preview and upon burning?