Hmm. Try downloading and running game-final.zip. Does that have the same problem? if so, there is something wrong with your SFML setup. If game-final runs, then there is something in your code. If the latter, see if you can spot code differences by inspection. I assume you mean the "Resume start music" line is where the fault is. If at some other place in the code, check that GameStart is being found (it is searched for) with log messages. In a pinch, leave the music off and continue with development.