Flickering when input comes from the AVR

Hi All

Just received my new Decklink Quad, when I am connecting my receiver to the card (any of the inputs) I can see horrible flickering every few seconds. if I connect the video source (in my case apple TV) directly to the card, the flickering is gone, any idea what may be wrong? (The HDMI cables are new and capable)

Thanks in advance.

AppleTV and HDCP encryption maybe?? Some HDMI sources may not be captured..

Try a laptop output and see if the problem is the same..