When you set up sequences, it's a really good idea to try to make additions or major changes to your models at time=0. I've had very similar kinds of issues you're having when I've tried to add stuff to a scene at a time other than 0. I've always just wrestled it by going to t=0 and resetting everything that neede fixed or deleting the messed up stuff and starting over by adding new things at t=0. I'm not much help on this one. -Kix

-Kix