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I've seen this before on some lots I downloaded. I found that if I placed the lots in a hood, deleted the original from the Lots and Houses bin, then made a change to the lot (such as using terrain paint, something that causes the lot impostors to be updated), saved it and put it back in the lots and houses bin, it worked fine. No idea what the cause is though!
I went thru the game files and it looks as though several files are missing when I compare to the game on the laptop. So, I think I will reinstall and see what happens.