I have two Macs; a late 2007 iMac and a late 2008 MacBook. On the iMac, playback works perfectly, on the macbook, I can't hear any scorch files- I don't get it. The settings and OS's are exactly the same 10.5.6 @44100 hz. Is anyone else having similar issues. And yes, I've tried restarting, re-installing, and running using rosetta.