Originally Posted by Gerco

ok, this is just off the cuff here. How is the CF card formated? If it's formated via windows that could be the issue. Try a program like "Mac Drive" which you install on your pc's then format under OS x. It will allow you to share external drives and storage between the different OS's. My CF cards are always formated in the camera (Nikon d2x) and I have never had an issue reading them in either my PC's or my Macbook pro.