Sorry! i forgot to mention that it was already set to CPU. I don't think my video card (NVIDIA Quadro K4000) is good enough. And maybe my tired, old CPU isn't either. It's i3-2100 3.1GHz
I had tried a few WAV files of various lengths and filenames. I just simplified one to be a bit more than one minute, mono, and with the filename JRE1.wav and the results were the same.