One thing that bugs me when working with an animation is that when you save the TGD with an animated camera you get two "previews" of the animated camera settings. The first is the camera position changes, followed by the camera orientation. Saving a TGD with 18,000 frames, needless to say, takes a while. To get around this, you can switch to the node network before saving, but if you forget... DO'H ... you're stuck until it's finished.