Did you try a backup or just replacing the houses (if you still have them in your library) ?
Do they disappear again if you re-place ?
I'm having the same issue on Mac OS, game was installed via Origin. After a day of playing houses are disapearing. Non of the described advises helped.
Are you using cloud sharing on your mac or are your save games local ? Any issues with error 22 ?
We save game locally, there were no any errors. Restart or starting new games do not help, houses disappear after some time during play. I will try to reinstall the game (is that possible with Mac Origin?). We just got DVD with the game in the store but actual Mac version had to be downloaded via Origin. Thank you for your help.
I don't think reinstalling will help much.
How much RAM and disc space do you have ?
You can try repairing the game through Origin though. Right click on it for the option.
