Resurrection Gorge bug?

I am in the process of doing this section of Dorn's quest line. I have gotten Yarrow's acorns, and have found the Great Tree, but there is nothing there. No sign of the Great Fil, or that demon, or any summoning circles; just a totlly blank landscape. Is there some sort of hidden entrance to the interior of the Tree? Because I have been poking around there for 15 minutes and have found zilch. What am I missing?
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Or ... am I supposed to do something with the acorns to open up the path? I put then in a gear slot and clicked on them, but nothing happened.
So, if you choose violence and kill her instead, you have to activate the acorn yourself to go down and back up. It goes in a quickslot. (Activating it sets a variable, and then the area script moves you.)