If the player is in idle mode (power: off) and player buttons are clicked, most images are not updated, so it looks like the button presses are being ignored.  However, if the power is then turned on, the images are then updated, which is confusing.

The exception is the volume levels.  Eg, if I directly change volume whilst the player is off, the indicators show the new volume level.  However, if the player is off and I click louder or softer a few times the volume indicators don't update; if I then turn the power on, the volume indicators do change.