During play with several characters of different alliances, I've discovered a few repeating errors that occur in Stonefalls and Shadowfen...

Stonefalls - Ash Mountain: After crossing the bridge from the south and approaching the tent where the npc quest-giver (Garyn Indoril, I believe), the game re-laods every time I approach him. The first time this happened was when I ran up to him and triggered the conversation just before the re-load occurred. After the re-laod, I was trapped in the close up view of him like we were conversing, but there was no dialogue, text or display and all buttons were unresponsive. I had to exit and restart the game to free myself from the non-conversation. The re-load happens ever time I approach his tent.

Shadowfen - "Unbridled Wealth" quest: After starting the quest, the dead guar appear and have the quest markers over them, but they cannot be interacted with (I've aimed the cursor everywhere on and around them, but the interaction prompt won't appear on any of them), preventing me from progressing through the quest.

Note that both of these errors began to occur after the Dark Brotherhood patch was released for the Xbox One.