I made a head rig with smart bones for a head turn and to move the mouth, eyes etc.
Works like a charm.
But when I am on an animation frame and I have closed, say, an eyelid with the smart bone and I want to finetune it a bit by moving a point from the eyelid it all goes wonky. The point moves to a random place and each time I click with the T tool the point moves to another place making things stranger and stranger.
Found this when I wanted to use AE Mix Smartbones to fix some errors when I mix the head turn with an eye blink. But that is impossible now because I can't correct the points on frame one, before running the script, because they move all over the place.