I got all the way through the dungeon and killed Mikrul Gaulderson. As I was on my way, I noticed a few kills that I couldn't loot, and then the same thing happened with Mikrul. After reloading and killing him several more times with the same outcome, I about gave up. As I was standing over his body, I ACCIDENTLY loaded the autosave that came up. Then he was lootable. Odd, but lucky. I would hate to have to go through all of that again.