Hi, I have a Q90T that is hooked to a Yamaha RX-V485 and all controlled by a Harmony remote. Everything seems to work fine, and switches between sources and the ARC works when viewing something through the TV. But I keep getting an error message when I first turn everything on that the audio source is connected to a port that does not support ARC. But the cable is indeed in port 3 on the TV which is designated as the one for ARC, and properly hooked up to the receiver! Any idea why, or how to correct it? The ARC does work so it's obviously hooked up right but the error message gets annoying as it pops up several times. TIA.