I have not had this problem before and I installed generations yesterday. I have no mods or cc in my game - just sim store stuff.
Earlier this evening I sent my sim to a party, it was a small affair there was 6 sims there plus my sim. At around 10.30pm sim time I sent my sim home, this is what he looked like when he got out of the car.....
And the close up....
Reset sim did not work and the other sims in the house were invisible as were most of the other sims in the town. My sims were unable to leave the house and certain actions like changing clothes caused the sim to stand still and become stuck. I exited to the main menu without saving and went back to the game but it was still the same, thankfully though once I quit the game and restarted it my sims were normal again.
