Spoilers for those who have not made it to Baldur's Gate yet.
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I'm fighting through Wyrm's Rock up to Gortash. My enemy combatants are stuck on the ground floor, I'm in the penthouse and Gortash and friends are stubbornly neutral. My last save before the assault is two hours ago.
My act III is not nearly as buggy as the first time around, but this one puts quite a damper on the enjoyment.