I'm having a really bizarre problem, and I've never run into it before. While animating my characters, in some instances, after reopening the file, for 3-5 frames, my character's mesh and skeleton disappear, and only the FBIK handles and effectors remain. This probably isn't a huge issue and I could correct it post-production, but I'd really love to know why it is happening and if there is a way to retrieve the lost information.