I just fixed one problem and I discover another.
I decided to test out the path where you betray Renal. The problem is that I can't figure out where to plant the evidence. I tried placing the scroll in every single container / table on the 2nd level of Renal's guildhouse, but none of these get any response from Mae'Var and I can't finish the quest. I tried the little knot hole near the east wall, both chests in the vicinity, the tables near the stairs, the nearby chest, and all four containers in the northwest room. Nothing.
Is there a specific container I'm supposed to use? Or is any container supposed to work? Does it make a difference if I tip Mae'Var off before or after obtaining the documents I'd normally use as evidence for Mae'Var's treachery?
I really do not want to have to start a new game just to get these quests to work, and I don't have a savegame prior to entering Renal's guildhouse, since I ran around and did some other things before stealing the necklace from the Talos temple.