To me, it's more like there is a strip missing from the walls so you can see the outside but I can see in the photo where it looks like the road outside is overlapping the walls.
It can get worse than the picture I posted but other times it will just be a thin strip of see-through wall.
Editing to add some more pics. These were intended as pictures of the sims rather than the glitch but you can see it happening on a different floor of the same house and No 3 is in another house in the same neighbourhood.
@Dorabella123 The first two screenshots look like there might still be a road outside; I can't tell what's going on with the third. If you let me know which world(s) and lot(s) are in your screenshots, I can take a look myself. Or, if you're comfortable, you can upload the save to a free filehosting site and send me the link. If you don't want to post it in this thread, feel free to PM me the link instead.
Either way, I'll take a look, but it'll have to be tomorrow... or rather, later today when it's not the middle of the night.
Please also attach your deviceconfig.log, in Documents > Electronic Arts > The Sims 3. I think you might have provided it before, but it would be helpful to have it specifically in this thread, so anyone else with the issue can compare hardware or graphics settings. As always, feel free to delete your user and comptuer names, about 20 lines down, but the file doesn't contain any other personal information.
