I recently tried connecting my 2010 iMac to an HDMI receiver and found out that the combination doesn't quite work; all of the AVR's HDMI inputs expect HDCP and the combination of my iMac and El Capitan apparently can't provide it in a way the AVR wants it. The audio comes through fine, but the video feed goes black for a second every seven or so seconds as the two fail to complete a handshake. When connecting directly to my projector the image is fine. Now, I'm willing to put the blame on the iMac here - it's pretty old. What I'd like to hear from all of you who have Macs and AVRs is that this combination CAN work just fine. That way I have something to look forward to when I eventually upgrade my Mac. So, which Mac and AVR do you have, working perfectly together despite HDCP? Note that I'm really only interested in cases where you're using HDMI connected to a HDCP-protected HDMI input on your AVR (some have inputs both with and without it). No HDMI splitters to strip out the HDCP, no AirPlay.