Rampagingwalrus posted...Never heard of actual quests disappearing.
However, the count for completed quests will change, as you do (raise) or abandon (lower) quests.
It was weird when my active quest list had items removed. I knew the NPC I needed to speak to for the quest, and when I spoke to them, the quest dialog was all there, and, when the next task of the quest was given by the NPC, the quest returned to my active quest list. I still chose to restart a previous save as several other quests went missing too. Haven't had THAT happen again, now it's just a problem with the completed list being altered. Haven't looked at the game stats which show the number of completed quests, but will keep an eye on those too.