Man, I had no more trouble after cleaning out the Harper's the last time. Jaheira said something about them not really being Harper's or they wouldn't act that way. I just reread your post and am thinking about when others have posted about the Harper business and Jaheira. I think you have to have 3 encounters with the Harpers and kill them. There's no one there but the Harpers? You can't attack them and leave the elves out of it?
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O_H_F