Since publish 80, players can no longer prolong the Magery Spell "Curse" by recasting it on their target.
The main problem is, Mass Curse, doesn't lower resistances, so if the target is effected by 'Mass Curse', only the stat reduction takes affect, and the player remains at 70/70/70/70/70 resistances for the duration of the spell or until remove curse is used.
Note: There was a similar bug in the same publish with Bless, that seems to have already been reported & fixed.
The main problem is, Mass Curse, doesn't lower resistances, so if the target is effected by 'Mass Curse', only the stat reduction takes affect, and the player remains at 70/70/70/70/70 resistances for the duration of the spell or until remove curse is used.
Note: There was a similar bug in the same publish with Bless, that seems to have already been reported & fixed.