What has happened to my ceiling?!?

I have this weird glitch thing with my ceiling and Sims. I have Friezes creating my second floor and I did have the ceiling area lights from Debug Mode. I have now deleted all of them as I thought it could have caused it. When I go into Camera Mode, as you can see in the background of this pic, the building behind doesn't have a roof. So I go to the second floor, and switch to camera mode to get the shot of the building in full. The second picture is what happens when I do that. I have tried waiting, thinking that it may need to refresh, but it doesn't change. I've never had this problem before. And I have no mods installed.





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Okay, the object hiding box wasn't ticked, so I ticked it and in camera mode from the second floor, I moved down to the ground floor and all my objects had disappeared. The ceiling was still blacked so I unticked the box again. But now my Sims look normal. Apart from transparent hair issues, this is the only glitch. I have only had this problem since I used Debug lighting, which I have completely removed. I have restarted the game afterwards.

//EDIT





Moderator edit: please use the "edit"-button on your post if you have anything to add, instead of double-posting.

- Carlos