Hello,
I did a practice run and had the following problem:
I played 3 ingame days and then saved my game. When I loaded my savegame later (it was not a .bad file), my sim was invisible. Only the plumbot was visible and when performing actions the used objects were also visible (e.g. food). Since it was only a practice run and only 3 days in, I just started a new game.
But what should I do if this happens in the real run?