It's not the 1st time I've heard that problem. LW's media player gets low priority for processing so it can be inconsistent. May I suggest you instead use your default mp3 player. Go to Tools>Options>Player & untick the option box, press Apply & OK buttons. Now your mp3 player shuld work if you have one. If not post back & I can suggest one. Apparently there's suppose to be some improvement in the new LW 4.2 when it's released soon.