spicylibra This can be mod-related, so please test with your Mods folder removed. It can also be related to an overly-protective antivirus, so check yours for any recent actions involving Sims 4. A useful test related to this (whether your AV says it's blocking the game or not) is to try playing with your computer offline. You can sign into the EA App and put it in offline mode, then disable wifi and/or disconnect the ethernet cable before pressing Play.
Using "save as" creates a new save slot independent of the others, so you'll retain a copy of the save in the state it was before you used "save as." A new slot does work some of the time and is also a good test.
