PLEASE HELP - I am a newb trying to take a screen shot from a movie playing on my MPB, but every time I take the picture, the file shows up as a gray/white checkerboard instead of the actual image. (See attached) I have tried using SHIFT+COMMAND+3 and SHIFT + COMMAND +4 The commands work fine on my MBP, except when trying to do them with a movie playing. All of my software is up to date, but I cannot get it to work. Can anyone please help me get this to work? All help and advice is greatly appreciated! Thanks!