I have never used a Dual Layer DVD Writer, but I imagine they write on both sides at the same time to increase speed on Dual Layered Disks.
Have you tried any other Writing programs? Intervideo, Roxio?
A Knight is sworn to Honour. His heart knows only Virtue. His blade defends the helpless. His might upholds the Weak. His word speaks only truth. His wrath undoes the Wicked.