>burn it in a Dual-Layer DVD
I don't know how this relates to a Mac, but this is what has to be done for dual layer on the Windows side of things
Run as Administrator http://forums.adobe.com/thread/969395 (Encore AND PPro)
Also, go back to http://forums.adobe.com/community/encore and enter
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You have addressed the most frequent solutions to this error.
I think it is problematic that you have uneven lengths ("trimming excess tracks"). I would look to fixing your assets prior to bringing them into Encore.
Is Encore transcoding them, or are they showing as "Do Not Transcode"?
I transcode them in advance ("Transcode now").
I've already deleted the timelines AND assets and re-create them and re-transcoded them and still the same problem.
About the excess tracks, after the transcode the audio track for some reason ends up being a little bit longer than the video track.
Previous times, I trim that out and the problem is fixed but not this time.
by the way I'm transcoding mpeg-2 videos (45 min long) in "NTSC DV Low quality 4mb CBR 1 pass". anything there?