I will say one thing, I have noticed in other games that sometimes things like quests can be bugged/unbugged for people for some strange reasons. One game had a bug in a quest that caused the quest to only be activated for players with Certain names. The code turned out to be that you were to talk to a NPC but when coded they had it where a name talked to NPC instead of a player. Other problems I have seen is that players with certain stats were able to activate the quest due to a flag they had from the stats. There is more then just one reason for the quest to be bugged and that is the biggest problems with games like these. Tring to find out why it is bugged and then fixing that problem. Though what you said is true it is not the only possiable reason.
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