I'm having a problem with the quest Speaking With Silence.
The problem I'm having is not with the door but with the cut scene where the player is shot with an arrow – it won't start. Mercer has opened the door and we are both standing in the final room, but nothing happens.
I've tried loading a save from before entering the dungeon, but it still doesn't work.
I'm playing on Xbox 360.
Best Answer
According to this bug list for Speaking with Silence, a proposed solution is the following:
Other suggested fixes, courtesy of this post, are:
and
Every other fix that I have come across involves using console commands to fix the situation, unfortunately.