Often times the skill lights up as if it's usable, but I have to swing my mouse around the screen like I'm lassoing a bull to find the "sweet spot" to get it to go off. From my understanding the update should have made it automatically target the nearest corpse. Many of my trials teammates are reporting similar issues with the skill. One theory is friendly pets are blocking line-of-sight to the corpse preventing the skill from activating. Please look into this issue.