Vendors always turn towards you when you use them. As long as they were facing away from you and conning indifferent when you clicked them, it doesn't matter if they're facing you afterwards. Faction and charisma-based item buy/sell prices are also set when you initially click them.
I can't say I've ever had this crash happen. My iksar monk has sneak sold to dozens of dubious vendors from all different factions. Weird.
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