Martin makes a point. Is it possible that how things are connected actually changed with the new stand? In any case, you do want to make certain the inputs are configured for hdmi audio, and the source outputs are configured for hdmi audio out. That's the only other thing I can think of as...
To clarify… all sources are connected to hdmi inputs on the receiver, then out to the TV. They aren’t connected directly to the TV. Then you get video but no audio.