Decursive is permanently broken - Blizzard made sure of that. The new version of decursive only highlights a raid member who needs decursing, it wont perform the decurse for you. I never used it on my priest or pally so I'm not fussed.
SCT works, I ran scholomance this morning and it worked fine.
The greatest delight is to mark one's enemy, prepare everything, avenge oneself thoroughly, and then go to sleep.