This just happened to me too. I have been stuck waiting on the Pippin quest, and decided to make my way back towards him from Rhalgr's Reach to give it one last try before logging out. I was approaching Pippin's location, but was far enough off that I couldn't even see him or the crowd of people when out of the blue I crashed with the same dx11 error. Tried to log back into the game, got through the queue to the loading screen, then dx11 error again.