Lots are disappearing

This newest update is causing some serious issues on my MacBook Pro, most notably both played and unplayed lots being completely empty and bulldozed after the loading screen finishes. I've repaired and restarted the game multiple times and it appears that even quitting without saving won't bring back the deleted lots. I'm now terrified to play the game that I've spent hundreds of dollars on, in case I lose valuable lots that I've spent hours building...please fix this ASAP!!!