I had a house I built on the sims 2, moved in my family and everything worked fineI added an upstairs and tried adding windows but they do not let light in upstairsThey aren't custom windows, and I don't even have custom content enabledWhat could the problem be?
Double check that you closed all the walls on the upper floorI'm unsure why, but sometimes something similar happens to me: one room, despite being all closed off, it behaves as if it's outsideLight doesn't go in, the lamps don't give off any light when a Sim goes inI'm unsure what else to try other than to rebuild on another lotEdit: I don't think it would be because you put the furniture in firstI do this a lot when I'm trying to see how much space my interior designs will needI guess it'll remain a mystery?
Sherry Trifle Recipe Nigella