Hi. We're experiencing the same problem. The ARC seems to do everything fine - turning on the v377 receiver, selecting inputs, etc. - except controlling the volume. When I use the volume button on the remote (we have a Vizio e70-c3) the volume bar shows up, but it doesn't increase or decrease. It use to work fine and then stopped working. I once was able to fix it by cycling the tv and receiver power, but that doesn't work anymore. Because we have different tvs, it seems it's a Yamaha v377 issue. What did you do to fix it? Thanks.