We are feeding a HDCP source with audio content into our board which contains an ADV7842 via one of it's HDMI inputs. At start up of our board a correct video image is output from the ADV7842 BUT there is no audio content - further investigation has revealed that no Audio InfoFrames are being received in this situation. We can remedy this by unplugging and replugging the source back into the ADV7842 input again. No ADV7842 registers are changed during this period. Why would the video via the ADV7842 be OK at the start (obviously HDCP has been successfully negotiated) BUT not the audio?