Much to the dismay of my wife and daughter who were watching TV in another room, I can confirm this works! I have J River MC also, right clicked on a song and selected to PLAY to the Denon. The unit was in Standby. It turned on and played the song. It also displayed a message on the TV, so it interrupted the program in progress. Sorry, girls. As batpig mentioned, "Network Standby" must be turned ON. The factory default is OFF.
5/10/12 at 7:16pm