Hmmm, so I had one of my sims move out of the household, she is a YA sim with 3 traits + one additional trait (Romantic), I moved her out to an empty lot and tried going to CAS through shift+click on the sim - > modify in CAS. Did my thing, and after confirming, I was skeptical, but I managed to get into the live mode safely. Tried one more time just to make sure and yep, still worked. I will try that with my other sims in my main household to see if some other sim is the problem. I do have a sim with more than 12 traits in that household (bought from the reward store, aspiration and skill traits and such) so it might be possible one of them is the problem.
There are two sims, both teens, that haven't gotten any additional traits. They just have the toddler/infant reward traits. All the other sims, including the one I talked about previously, the YA sim, have at least one trait that they got through the game asking if I want that trait for them.
I will post an update once I have time to play again. Hopefully I will be able to pinpoint which sim might be the culprit.
Alright, so I put all my sims into different households and through trial and error i figured out which sim is causing the trouble. She's an elder sim (was an adult when it happened first). She has the following traits: childish, neat and genius (she got these upon aging up), plus outgoing, cheerful and glutton and the bonus trait good manners (got those through gameplay), as well as the traits always welcome, great kisser and carefree (which i purchased from the reward store).
She only has one day to live anyway. I will try the gallery method and I will post an update.
