Bristowe, I believe that quests like these (edwin's nether scroll) will only continue/trigger once you get back to Athkatla or more precisely, as soon as you finish the Underdark Chapter. Otherwise, you wouldn't be able to solve Edwin's nasty little problem because the people you'd need are not in the Underdark. This also works for Jaheira's harper quest, Mazzy's quest, etc. They only work in Chapter 2 or in Chapter 5/6 (can't remember the correct no.)
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Melusine, Archbabe of the OHF and the LH
Your voice is ambrosia