@DonroaAkashu That was an interesting thread. The glitch was only when looking at certain angles. 1st floors and walls would just disappear, but if I changed the camera angle, it looked fine. I wasn't using glass flooring. I did have one building with a glass roof, but not the building I had the glitch with. In fact, I changed the roof to regular roofing just to see if that made a difference at the time, but it did not. I didn't have different heights or use platforms. I am thinking it had something to do with a basement I'd taken out. I had put a new basement in, but didn't delete the old one. Just picked it up and removed it. When I realized later that you could delete a basement, I deleted the new basement and started over with the basement tool, hoping that would work. I don't know if that made a difference or not. I had assumed it was the hot spring bath because I didn't have a problem once I took it off of the lot. But looking back, I think I had deleted the basement and replaced it right before removing the hot spring, so perhaps I had to take the hot spring out in order for it to be completely fixed. But I'm just guessing here. I'm just glad that it's ok now. And hopefully, if anyone else has this problem, doing the things I did might help. Thanks.