I made a post on Steam about doors disappearing as well:
"Alright, so I'm playing, maybe 50 minutes into the game after the intro area where you are suppose to go to this town to speak to a knight. I'm in the town, I enter the barracks, speak to buddy, I go back outside and begin to talk with everyone around. After doing so I wanted to go back to the barracks and all the doors transformed into bricks... Yup bricks, I look around and see all the houses where the doors once were are now just black... Unfortunately it won't allow me to enter into the abyss. I reloaded my last quick save and auto save in hope that will reset it which it doesn't. I exited the game and restarted computer, tried again, same thing. It won't allow me to take a screen shot, when I paste it in paint, its just black. I made a save game right before entering the town and all the doors are normal so I will have to replay the last 30+ minutes which really sucks and I'm sure this won't be the last time either. Anyone else have this issue? The game definitely needs a big update/patch, something tells me that won't happen for quite awhile."
Hope someone, somewhere can help us with this.