Apologies to bother again, but for some reason, at the exit of Irenicus's dungeon, when meeting Drizzt with Sandrah and wulfgar in the party, Sandrah does not intervene at all, nor does she give the option she would provide of pursuing Region of terror without having drizzt in the party. According to the guide, she should provide an option to go with a regular group. She doesn't seem to be interacting with the drow at all: no dialogue.
I remember this problem happening to me in the past, once; I can't remember how I did solve it.
My unlucky day, today *sighs*