I didn't move anything. I even saved all the time after doing something. My objects are well. Some are spline( like the door knowbs) and the rest are just cubes , some cubes i did Boolean operations to cut open. And it doesn't seem like any objects are hidden , i see no lighter text. Doing test render just renders without any of the objects that are missing. man, this is a mystery. My house is gone!!: ) It's strange, maybe i should have grouped all the objects in the house and it wouldn't have disappeared. but oh well here are some pictures for ou to see. One is full render when i had my rooms, second is picture of the reopened file with objects gone and notice too. in the one with gone objects, i think where i used a cube to do a subtract boolean to make a hole for the door, notice that the cube i used is there but the room is not. weird, it reversed the boolean