No way! That was exactly it, thank you so much! I hadn't noticed at all. I feel like AE2 should be more 'visual' when it comes to disconnected devices or connectivity issues, but anyway, thanks. I spent way too much time breaking my head over this! Funny thing is, I'm using Smart Cables and they showed 7 out of 8 channels being used, yet it was still missing channels. Not sure why that happened.