Why is the play/stop button on the player disabled (grayed out)?

The play/stop button is disabled when the station is not yet loaded into the player. Tuner2 automatically loads the last played station into the player. If you run Tuner2 for the first time, there will be no station loaded into the player yet. Simply browse for stations in the "Stations" tab or click here to find more ways to load a station into the player.