Build mode not working, can't save game

Update to original post:

I suspected the issues might have something to do with the latest update or the last pack I installed (which was "for rent" and I heard people had the problems I was having after installing it), so I ended up purchasing the Lovestruck expansion pack with the hope they might have fixed whatever bug caused the problems in the first place in this newest release pack... 

This has actually worked, and everything's working just fine again, but obviously this is not a viable option for everyone as you've got to spend even MORE money to make a game work that you've already spent money on 🙄

I have this problem! Might be the new update. I literally can't do any event or ANYTHING without the game freezing and not letting me do a thing. So frustrating! (I have tried it with and without mods n CC, and it happens both times. So, based on that, I feel it's just a problem with the base game. I have the vampire and pet packs, and that's it-)

i'm having the same issues. i can't play the game for more than 5 seconds before it messes up. I can't place walls and i can't place objects... then I try to save and exit and it takes 15 years, so i end up just hard quitting it which loses the whole save so that my computer doesn't combust.