When my party enters "Sir BillyBob's Farm" for the first time, I get a message that Sir BillyBob has cast "Protection from Evil." When the party gets to Sir BillyBob's location, no one is there. When I save and reload at that point, there is a brief flash at Sir BillyBob's location as the "Protection from Evil" spell is cast, but he seems to be invisible.
I got Sir BillyBob to appear by using NearInfinity to remove the "Staff of the Magi" from Sir BillyBob's equipment list and reloading at the autosave prior to entering "Sir BillyBob's Farm." I think the problem is that the "Staff of the Magi" makes a character invisible upon equipping with it; when Sir BillyBob equips with the staff then he goes invisible and you cannot find him.
The "fixed" Staff of the Magi that hides Sir BillyBob may be due to a BGT_Fix or some other fix, so I have attached my Wiedu.log
Thanks!
Pablo