From what I've read, this issue has been fixed, but for the life of me, I still can't accumulate shadow charges when I use my 2 ranks of shrouding strike. For my test subjects, I've used those swarmhorde spiders and assorted King's Forest loitering drow, which go down well before the 2nd rank specified time of 7 seconds. They get the little curse ball above them, but still no accumulation charges.
I've had Executioner's Strike for weeks and recently spent a point in both Improved Invisibility and Untouchable to see if that would build them up on the hotbar, but it still hasn't.
What am I doing wrong?