User blog comment:Dragonlordsora/Forsworn Conspiracy Randomly Ended/@comment-4057437-20120402073250

While this particular bug hasn't happened, we have had many other quests get bugged for what we think is the same reason: killing off the bandits/forsworn that often occupy a quest site  prior to the quest being triggered. Perhaps this is what has happened to you, during your adventuring, you killed someone that trigggered the bug.