I'm finding this rather frustrating, but I have came across beasts that no longer engage me. Frostbite Spiders, wolves etc. Bears and Trolls are still aggressive, but when I see wolves, they stand around looking at me. I went into a dungeon and the spiders just stood around looking at me. They were easy kills. This has happend quite a few times since 1.2. It's almost like it fails to load code sometimes?
I once had people do this until I reloaded. But that has not occurred again.