Well my saved game from 1.4 was in the middle of fighting a death knight in act 1. With 1.41, when I loaded the game, the death knight had no sword and was trying to punch my character to death. Now in 1.42 (from the 1.4 save), he has his sword back but is still doing tiny crushing damage - i.e., from fists - even though he appears to be attacking with his sword. Even if the knight manages to hit me he does next to zero damage.

EDIT: a save and reload solved the problem