slice11217 wrote:It's not a bug! Look very closely at the beginning of the movie. Greg cycles through the actions to show the different positions. Only one of the positions has a keyframe on frame 1! The rest are very likely a frame 0 keyframe modification. When he goes to apply the actions to the timeline, the only one of the actions that records a keyframe is the one with a key on frame 1!
That's what I noticed. It looks to me like this is user error.
You are right. To me this kind of thing is always hard to explain. If you don't mark a keyframe in you action, AS will interpolate the keyframes which are just before and after your referenced action. This behavior is fantastic for actions which involves just a part of the character, for example, lift the right eyebrow or change the color of the cheeks. And, of course, blend morph multiply the possibilities.