Guess What! I just had it happen again! I started a new game, I put Streamlet Single from the gallery on my computer into Civic Cliffs and Crick Cabana also from my gallery into Cookout Lookout and went into my save, tried to edit the lot, couldn't so I went into Manage worlds and there she was, the dreaded Signature Queen Anne Living Room. Now I do have my mods back so I have some hunting to do. Either I just got Lucky the other day with no mods or one of my mods has this broken room embedded.
I'm thinking it has to be an older yet still functioning mod because I've had this issue a long time and most of the script mods have been updated. I'll keep you updated as to how it goes. I have put in some other lots as well in Newcrest but I made those all from scratch to make sure nothing came with a newly downloaded lot. I'm sure Streamlet SIngle and Crick Cabana are not the source as they were installed by Maxis with the game.