I have been playing TESO without problems until I enabled Auto-Looting yesterday.
Within two hours, I then experienced two buggy quests that now cannot be completed. It looks like the game does not notice things that already have been collected and insists in recollecting them, which is not possible to do a second time.
Question: Is it possible that Auto-Looting breaks Quests in Europe?
Theory: Because the EU megaserver still sits in the USA, in Europe we sometimes experience lag. Auto-Looting works very fast, but the Quest engine seems to depend on the network connection and works slower. Perhaps in laggy situations Auto-Looting collects items too fast, so that the Quest engine then comes to late to recognize the items (which have already been moved away from the scene into the inventory).