I have experienced very few problems with Poser4. I have had it lock up. I have had it twist figures into physiologically impossible contortions. I have also had to land an A-6 without the right landing gear locked. Landing the A-6 was a bit worse. At least with Poser4 I have not soiled my flightsuit ... yet. Seriously, though I have not had Poser4 for very long, I just have not had the problems I have heard many people talk about ... yet.