The movie is "The Truth That Is Always Present". It's an unencrypted spiritual DVD by a teacher named Adyashanti. I have about 10 of his movies to copy, and all of the newer ones work fine. The two older movies, from 2003, have a different label and production company, and they don't copy.
Each of the two movies play okay in a DVD player. However, they start up differently than most movies. When you put it in the player, it doesn't seem to have a normal start menu. Right away, you have to choose between two options: "start the movie" or "chapter select". Maybe the different format is fouling up CloneDVD??