Kish, I haven't multiple strongholds hack, neighter other mods, only g3 fixes and tweaks (w/o multiple strongholds!). I have fixed my quest with summoning proper NPC, BHAnval, instead of just Anval, which has also summoned Talos guy with him and the quest continued. Considering sourse ot this bug - I think it may be because of older mod version, which I updated only after I visited Temple District the first time. So there is all ok with this part of the mod!
I have other bug to report though, it isn't critical, but present. In the same quest, when both the temples invites Aerie and Viconia and you go to Talos first - the Lathander illithium guy asks Aerie about party working for Talos and the aswers to that are leading to opposite results. It isn't horrible though as the right answer is still there =)
Anyway, the mod is awesome! Thanks a lot for it, my favorite game is now shines with new colors, still remaining authentic.