Weird Physics Glitch?

When I was playing around with some of my motion datas and models, I loaded one of my favorite Rin models to do ColorfulxMelody. About 2/3rds of the way in, the model suddenly just lost everything that had physics on it. Her arm sleeves, most of her hair, and awkwardly enough, the bottom half of her dress. >.>; This also happened to one of my Miku models, so I think this is a glitch. Please fix? Its kind of weird hoping the parts physics dont disappear in the middle of a motion ^^; Thanks!

Yukimiraku about MMDPlayer