Yep, me too. I even tried to chat with support:
Hi, my name is Angelina. How may I help you?
2323574800: Hi, I can't seem to complete a quest
2323574800: Act of Mercy
2323574800: Thrask is mia
Angelina: I would appreciate if your specify your issue in detail
2323574800: I'm referring to Dragon age 2, the quest is "Act of Mercy" and I have slain the Templars but The guy you need to see to complete the quest, Sir Thrask, is gone and can't be found.
Angelina: May I know from where did your purchase the game ?
2323574800: Steam
Angelina: In that case you need to contact to steam
2323574800: Huh? Clearly this is a game issue, not a distribution one
Angelina: I would like inform to you that this is ingame issue and we are here for technical support, so I would issue to you that post your issue on game official forum where our game developer see your post
2323574800: well, this was a waste of time, thanks
'2323574800' disconnected ('Concluded by End-user').