I began experiencing this issue today. I've been gone for two weeks at work. There is a delay when placing an object that I purchased in build mode. I am unable to sell or remove the item, and it also frequently vanishes. All I am doing is improving my rental on a rental lot. I return to live mode after any of these events, and there is stuttering instability that lasts for a few seconds before it clears up. it's not my graphics driver because I updated it after these issues began and it did not fix the problem. I can move, upgrade, cook, take a shower, go to another unit, and go back; however, as soon as I open build mode and buy or move anything, it is over and sometimes it affects saving. I was stuck in save a few times, but I waited, and it eventually saved a couple of times. Several times today, I had to manually close the program because it was simply stuck on saving. This is the 4th New game that I have tried to rebuild my Sims lives, and I have a feeling this save is going to end up like the others. Just for the record undo does not work either.