Yes... don't rely on the LW media player for consistent results. Use an alternative player for playback if you're having this issue. A good one which is free & has built in codecs & plays everything is QCD: http://www.quinnware.com/ Might want to make it your default player (select any mp3 file outside of LW, go to File>Properties>Open with & choose your app. Then choose always open with.)

You'd need to go to LW's menu Tools>Options>Player & untick the player option & press the Apply button. Now your default player will launch everytime you launch a song.