Oath of Desecration and Rage are still stacking on both my warriors, too. One has a two-handed sword with 5 points in Man-At-Arms and 4 points in Witchcraft (he casts Oath on the second warrior), the other has a two-handed axe and can use Rage after being buffed with Oath and both the buff icon and damage increase are showing up.
I'm not complaining though.
