I am practicing putting a little animation together but something wierd keeps happening and not all the time. If a make a really small change, like the angle someone is sitting at, when I go to run the animation through some of the characters disappear even though their costumes are still there and move and another character , just  becomes broken altogether, splatted and crumpled.

LBP3's bugs. I had that one too. I really wonder why it happens...