Hello, I have a Quick Time from an Avid 145 DNX codec, instead of the 220. It plays on my Mac Pro, but has a horizontal split, with the bottom half all black. Other than that, it plays with pix and audio fine. Do I need to set the Quick Time Preferences differently, or make sure that I have the 145DNX codec, as well as the 220? No I am not having a half off sale!!! Thanks for the help.