QUOTE(Palpenious @ Jun 29 2008, 06:21 PM)

If you don't want to try the mods that are supposed to fix it, when you get to the grove, open the console,
type setstage SE11 160. You should get a journal update saying you slew your doppelganger, then the branch will be added automatically I think. If not just activate the tree and it should work now. After this, turning around to leave, the gate out was still locked in my game, if that happens just open the console again and click on the gate/and/or teleporter and type unlock. I guess the double was supposed to have a key or something. Yeah, it's an annoying workaround, so you might want to try the mod fixes first, one of the big downsides is this method you won't get the Shadowrend, which is a cool black weapon your double uses, and drops after you kill it. But, like you said, it's better than starting a 30+ game over from scratch, good luck.
That worked ok, at least I got out of there and can continue with the Quest. I thank you......
Modeler99