I'm currently on the quest "assassin at large". The Duc has died, I have the quest to get to twin elms although once I get to the Eastern exit of Elmshore,  all of twin elms is still greyed out.

Am I doing something wrong or ?

Try to exit Elmshore through the south-eastern exits (lake shore will be north of you, rather than south).

 

Ideally, the north-eastern exit should also work (I'll flag this to be resolved for an upcoming patch).

 

Jorge

Oh, incidentally, I ran into a similar problem in Woodend Plains; I didn't even know there was anything to the south of it until I was asking a friend about how to progress Sagani's quest because I wasn't hitting the correct south exit point.

Yeah, we've taken notice that this happens more often than we expected. We're planning a solution for those cases where the geography/landmarks of the area do not clearly convey that a new area lies just beyond a transition.

Excellent. Thank you. 

I got to this point in my last character...then realized I was displeased with how he turned out and rerolled.