I had the very same problem as mp35486. I attached a scan of my burn, note that I have the same brand of discs that he does. The problem only occured when I burned with 8x speed, 4x worked just fine.
After I got the same problematic result with two different DVD image files and two consecutive burns, I decided to flash the drive with the newest firmware available from Lite-On site (DR16CS0K.zip).
After flashing & rebooting the problem disappeared, hopefully the new firmware took care of it for good. At least is doesn't let us burn those Verbatim 8x discs with 12x anymore :).