Ok guys maybe I'll add another hint. Make sure you don't play any music while starting SonicStage AND what is also important: 1) never copy to the player the file you are listening in the very moment - even if listening in SonicStage! 2) never listen to any music file while copying any file to the player 3) not listening to a file means closing it or stopping - pause is not an option! 4) if it does not help either restart your system and do not run any music program - start only SonicStage! Anyway the problem is related to music codecs as I wrote in the post before. So if there is no other solution make sure to uninstall all codecs/drivers which were not provided with your system.