For anyone else that may find this useful: annoying bug threatening to derail my game but found fix on gog.com. When you show up in underdark all Drow are immediately hostile. If you enter Ust Natha non-name Drow immediately attack. Found this answer after quick google search, thank-you to "Ousteoune" and "Hickory"! Important part is to use this CLUA code BEFORE YOU GO INTO THE CITY THE FIRST TIME! If you this happens your last auto save should be able to let you fix this if you don't have anything else.
Hickory deserves credit for this solution.
My appreciation also to Ergos for his willingness to research this problem further had it proved necessary.