No animals visible :( (Farming Simulator 2013)

The game has stopped displaying animals !? When I buy 1-2 cows (for example), I hear them, but I can't see them: (and so with everyone (chickens, sheep, pigs) I reinstalled the game many times, there is no result. What is most interesting is that first everything was fine, everything worked and I could admire my (cattle) and then something happened and now I'm trying to find a solution to this problem. options how to fix this ?! Thank you very much for the early ones! :)