Have you updated to the latest version of quicktime?
Can you see any other ouput from an app through the card eg FCP?
Have you hit the video preview button in Shake?
Have you set the number of monitors correctly in globals so that it forces the preview to the card?
Peter
Now editing the feature “BEYOND THE MARGIN”
-THE LIFE AND WORK OF JOHN A.ALONZO
https://www.peterwiggins.com