I submitted a bug report about this, but thought I would check and see if I'm just missing something.
In the Claw of Vulkoor (Red Fens), I took my level 7 ranger in, 16 Move silent/Hide and had no problems doing the entire dungeon stealthed until the very last scorpion guardian. (This was on casual)
This guardian, right before you complete the dungeon, is sitting right smack on top of the pressure plate. I was able to stealth up to him and "bump" into him from all sides except the front. There was nothing I could do to get the staff on top of the plate. Bumping him from the front causes him to agro instantly.
I can't Bluff him to move because it says he is immune to it. So is this broken or is there some way to get that staff onto the plate that i'm missing? I'm pretty sure it's bugged, but like I said, thought I would check.