Hey,
So, it's been almost a year since they posted this and no one has answered, no one has at least found a solution. I have the same issue, I recently bought and set up my new pc and after trying a few games the only one that wouldn't work properly was The Sims 4. Only the mirrors would not work, that is.
Anyway, I checked it with EA support and Sims 4 community and the conclusion was it has to be some kind of issue with the graphic card., cause as this lad said in this post, I can still use it in my old laptop and it works.
If anyone know/can provide any kind of information about this, it would be much appreciated.
Thx.