Sounds about right, I have gone through countless boxes, configs. It kills both a full samsung setup in the living room, and a full sony setup, so it's not a problem with them. It's Time Warners problem pure and simple. Without the boxes, all devices work, with them, Netflix, Amazon, UHD Blu-Ray player all wont transmit sounds through ARC on TV.
Have you tried a CEC lift hdmi adapter?
You can make one with a Hdmi to DVI cable and DVI to hdmi adapter . It strips off pin 13 and disables CEC
I tried stripping off pin 13 on my HDMI cable going into the cable box but I'm still seeing problems controlling ARC on my TV. Does it need to be taken off both ends of just the end going into the cable box?
Thanks, I manually stripped the pin 13 off the one end of the HDMI cable but the other ARC devices in my entertainment system aren't working like they would if it was totally disconnected...because if I totally unplug the cable everything is fine...wonder if I'm still missing a piece of it deep inside the connector...
Get a male hdmi to male DVI cable and a female DVI to hdmi male hard adapter, there's no pin 13 (cec) in a DVI connector so it's really dead.
Or you can but a male-female HDMI cec strip off adapter...