I created a new character with the Construction Set and placed her in the Gnisis Madach Tradehouse, but when I try to talk to her, I unfailingly have "Who's There?" triggering. (She seems to be zoned out in general -- she didn't even respond when I stole something in the room.) This appears to be a common problem, but I can't find a resolution through Google; can anyone describe or refer me to a solution?

For some reason your NPC can't see you. Check what spell effects or diseases she has, or maybe your own PC had contracted some permanent invisibility.

Really?

Thanks for telling me this; I'll have to look harder here. I created a new 'test account' character, and dialogue with other chars works, so I must have forgotten to drag eyes onto the new character in the Construction Kit, or something.

Thanks again!