I noticed this in several places and thought they were just doors that I had no real access to, but after getting stuck I realize that it's a legitimate bug.

I can't get out of this room and no amount of reloading will save me.

Progress halted until the next patch arrives, I guess.

Thank you for the information, Supreme. I posted a reply to the issue you encountered, here:

 

http://forums.obsidian.net/topic/75399-unopenable-door-in-raedrics-hold-dungeon/page-2

 

We're already narrowing the issue down so that we can resolve it in an update. In the meantime, the linked post will show you how to progress out of Webb's room.

 

Jorge