Macbook 13-inch, Mid 2010 Processor 2.4 GHz Intel Core 2 Duo Software Mac OS X Lion 10.7.2 (11C74) Version 1.1.12 I have exactly the same problem! It happens whenever I speed it up... It happens with 1.4x, 1.3x, 1.2x and 1.1x speed. I never had this problem with kmplayer on my PC and now I switched ...