I realize that the IP command set isn’t completely supported yet. I was however surprised to find that the Media Player Input isn’t supported. It does work with the AVR Zone 1 command set. The Blu Ray, Cabl/Sat, and Network/Pandora inputs all work with the IP command set. I haven’t had occasion to try any of the other inputs.
I do like having the album art available using the IP command set and I primarily use it with Pandora. It is still a little flaky in Zone 2 if you are using Zone 1 you get album art. If you aren’t using Zone 1 nothing is displayed. You also have to prompt the display to work by tapping one of the up or down arrows and that seems to get the Pandora menu to pop up. Sometimes you have album art sometimes not.