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New bug concerning the same priest in Haragon.

I also noticed that using Poison Treatment is targeting the enemy and not the player's party.

This is very strange. It's really late so I'll have to take a look at it in the morning but maybe try a fresh install of the game?
Perhaps if you have an older version installed it's conflicting with it somehow? 
I'm totally baffled, to be honest.

The fresh install fixed the priest issue.

Glad to hear that!