Sims not graduating in University

My sims are not graduating in the University. I got my The Sims 3: University from Games4theworld. When I enrolled my sims for University for 1 term they went automatically and finished their term. There's something that popped out saying something about re-enrolling in University and when I re-enrolled them for another term, they finished their term and nothing happened, In fact they are stuck in the University, when they were about to go home from University, their actions suddenly disappeared including the "Go home" action. I waited for a sim hour and they are still not going home! Help!!