Was just farming for the mounts, when coming to Attemen the Huntsman from Return to Karazhan, I used Flurry, I bring the boss down. I get credit for the kill, but I am not eligible for any of the loot that drops. The same thing was happening last week too, with any bosses killed in one shot with Flurry, credit for the kill, not eligible for any loot.
And nothing gets sent to the mailbox by the post master either.