SUCCESS!
You guys might find this interesting -- and maybe applicable in other places.
Ever since I played the Splinter Cell series (ultimate stealth), I've played all subsequent games the same way (if possible). Then, on the Splinter Cell forum, I challenged all players to play the entire game WITHOUT killing anyone (except shoot the boss thru the window with sniper to end the game). Immediately I got a flood of responses "that's impossible". Well I did -- with an ending screenshot of # of kills.
So when the STEALTH talent appeared in DAO, I poured everything into it since it becomes an ENTIRELY different game when played in stealth.
In DAO, I tell the squad to HOLD position while I go invisible to scout out the area and disarm traps. Even in a room full of baddies, I can position myself down the hallway (or corner) and pick them off with arrows from behind. When entering Andraste's temple, I went invisible, up and to the LEFT thru a horde of cultists -- alone and getting the key and returning quietly, closing the door. Other places, I disarm traps, assess the area, then call my squad to wipe them out -- since alone I can't continue.
Apparently that stealth technique didn't work from the big room (Ortan Thaig) where the twin giant sculptures hold up the ceiling -- to the room with Branka's Journal lies. I put the group on HOLD and went invisible to clear out the area. Being invisible, there was ONE spider in the beginning (labeled "corrupted spider") that didn't move (obviously since I was invisible) so I continued on -- wiped out the baddies & called my squad. Branka's Journal would not read. What the heck?
I retraced myself back (taking my squad with me) - visible and sure enough, there was that "corrupted spider" standing there. I couldn't activate the spider (get a red circle under it) so I used Morrigan to hit it with a firebolt. Nothing. Dang! Apparently that spider is what held up the works.
So I reloaded my save from the beginning of Ortan Thaig. This time VISIBLE so all spiders will scurry away. Eventually the journal was readable. Looks like the spiders are not a PRE-requisite but a CO-requisite (bad programming). This might apply elsewhere.