just to check you are not missing the last step: you have to delete the old "lib" and "build" directory (or use "make clean") and compile again the sources with the "make" command after copying the new source file.
I did forget to do that, but I did and it still froze for me.
Here you are. I just found a free wav by googling. (I did rename it when I placed it on my SD Card)Can you upload me the wav you're trying to reproduce? (Are you sure the wav is mono?)
https://dl.dropboxusercontent.com/u/20407697/1kHz_44100Hz_16bit_30sec.wav