After the next reboot you all will notice more partial damage being applied when casting spells. There was a miscalculation in the code that allowed spells to always hit for full damage past level 50.
NPC resists are going to play a larger roll in the calculation of the partial damage now with the fix in place. Some adjustments may happen to NPC resists over the next week or so as feedback is given.
Just giving you all a heads up =)