As you can see, this has been around for a while. I thought Peter addressed it at some point and said the extra click was, in fact, the drum track starting over again by mistake.

http://www.pgmusic.com/forums/ubbthreads...true#Post114488
http://www.pgmusic.com/forums/ubbthreads...true#Post100943
http://www.pgmusic.com/forums/ubbthreads...=true#Post88488
http://www.pgmusic.com/forums/ubbthreads...true#Post133567