Do Deuterocanonicals Refute Any Protestant Teaching?

One in particular comes quickly to mind: praying for the dead, as noted in 2 Maccabees 12:39-45. For more information on the deuterocanonical books, please listen to this audio interview with Gary Michuta, “Why Catholic Bibles Are Bigger.”  Gary is the author of a book by the same name.

See also this article and this article re: the deuterocanonicals.