Same here - I was able to get to Endless Paths level 6-7 originally after beating Maerwald the first time (or whatever his name is), can't recall if I got to level 8, then left to quest in Copperlane. Came back with a new party member, some construction completed - most recently, the dungeon. Hired a few troops for the keep too.
Got the same as above: statue unresponsive, door closed when it used to be open, ghosts reappearing. I even managed to find my way back down into Endless Paths via the side entrance on the grounds. I collected Whispers of Yenwood again, just like the user above. All enemies are now reset in Endless Paths, fog of war restored. I even fought and easily beat Maerwald again, and got a duplicate ability from the encounter.
http://i.imgur.com/IP1y95O.jpg