The problem could be anywhere, but if they are vanishing when being spoken to for quests, it is almost certainly in a script somewhere.  It could be a player.pl (since they can use EVENT_SAY now) or something in templates that is causing it.  Could even be a plugin somewhere.  It would be really hard to say without direct access to all of your scripts. 
		
	
		
		
		
		
		
		
			
		
		
		
		
		
		
	
		
		
	
	
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