Is anyone else confused by keying in FCPX? I had an old shot in front of a green screen (admittedly a bad one) shot on a red one, and had a lot of trouble perfecting the key. As I added more color samples and edge samples to the key, the look of the key would start to change throughout the shot. I would have thought that since I never added a keyframe to the shot, it should have applied those parameters to the entire shot equally. Has anyone else experimented with keying?