Having the same issue - I purchased and downloaded two item packs (Castle and Bistro) and now it won't let me save new progress on builds -- I have tried 'save' and 'save as' but it will not recognize a new save file - any changes I make to properties and try to save will be reversed upon exiting to property manager and reloading the building. I have the 'for rent' and 'pets' packages as well, but they never gave me any trouble until downloading the Castle and Bistro item packs.
Any advice would be greatly appreciated - I'm tired of building something amazing and coming back later only to realize it's in digital oblivion.
The Sims Team
