A few movies of mine have started having difficulty properly decoding DTS or Dolby sound (or any other encoded audio). My receiver is a Sony STR-DE885 with digital audio input. I hope that description rings a bell or two, cause otherwise I'm not quite sure what to say about it. I'm running on an 2.4 dual core 2 iMac 10.6.4. I searched a bit for this same problem but not sure if I was searching for the right thing.