I have a similar Problem. I cleared Level 2 of the Endless Paths, created a new savegame and jumped down to lvl 5 and the Drake. That area already was completely bugged (not being able to select party members etc.). After i attacked the Drake and saw that i had no chance at the moment i loaded my savegame from Level 2. The Game then gave me a Party Selection including two blank characters called "*NameError*". Those are invisible and/or stuck in the Enviroment and i can't leave the area. Game's broken for me.
You can find my savegames here, all of them are borked.
https://www.dropbox.com/s/mj1ivj9o3bbzake/Pillars%20of%20Eternity.zip?dl=0
Also, here you have some screenshots. Had to upload them to Dropbox too, because the Forum is similarly broken.
https://www.dropbox.com/s/nluympyw3ac9nz8/2015-03-28_00001.jpg?dl=0
https://www.dropbox.com/s/4al416hkjdnqmq3/2015-03-28_00002.jpg?dl=0
