Some of those music tracks may be in a format or bit rate that is not supported by the GoGear player like AAC or files in variable bit rate may be skipped by the player. > MP3 supports 32 ?320kbps > WMA supports 5-192kbps with sampling rate 8.0kHz up to 44.1kHz Some of the downloaded tracks may be corrupted and your GoGear is unable to play them. Use the Firmware Manager to restore your GoGear to the factory setting. Some of those music tracks may be copy protected which is are not supported by your GoGear player.