Quest marker to go into secret passage for Ander's quest "Dissent" gone [ Edited ]

[AslinnMoonbreeze]

I am playing Dragon Age 2 and have run into a bug I cannot find a solution or even mention for. The game is indicating that to start "Dissent" I need to enter Darktown. However, when I enter Darktown there is no quest marker at the entrance for the passage that leads to the cave where you confront Templars. I have tried loading, and also quitting the game and neither worked. The quest is still in my journal. I have not completed it. I have not started it. The quest marker has just disappeared and I cannot start the quest now. I am play on PC. Can anyone help me? 

EDIT: I have fixed this, please disregard

[vit4243]

How did you fix the bug?  I am having the same issue.  I can't go into the Gallows Dungeon at all.

[EA_Zoe]

Hi @vit4243,

Is Anders in your party? Do you remember when you spoke with him last?