All lots reverted back to default lots?
I noticed on the neighborhood view my houses that I built were no longer showing up. The houses are the default lots when you start a new neighborhood and when I entered a lot that had a house I had built on it, the lot was empty. I only went onto one lot because I fear my houses will all be gone. The only house that is showing correctly is the Von-Windenburg Estate which was the lot I entered the game on. I exited the game and re-entered the incorrectly imaged lot and the lot was once again empty. I do not use any mods or cc. My game was fine prior to today's update/pack release.
simhead82 Okay, then I'm not sure why it crumbles some of the time. (I've recreated this kind of behavior in a pattern that mimics OneDrive interference, and sometimes antivirus interference, but that's all for now.) So I would say that you just need to be very careful with it and keep backups.
If you want to test whether the save is holding together during a play session, use "save as" to create a new save slot, then look at the save file size. The size can vary a bit, but if it's decreased by more than a trivial amount, say 2-5 MB, that play session is probably toast and you'll need to revert.