PCM audio won't output

A strange thing start happening recently with my mac mini. I have it connected to my Onkyo 5300 HT using the optical Toslink cable. Everything works fine with the audio output from stereo files (my HT sees that as a PCM stream) and everything works fine with DTS or Dolby 5.1 files. But when I start playing any 5.1 or DTS file I cannot play a stereo file again. That affects all programs I use to play it (iTunes, Boxee, VLC). 5.1 files continue to work fine and my receiver can only detect DTS and Dolby streams comming from the mini. The only thing that solves it is a restart. After the restart I can play the stereo (PCM) files again, but as soon as I try any 5.1 audio file the problem starts again. Already tried to reset the HT and disconnect the Toslink cable, also tried to chang the MIDI audio settings and even tried to kill the audiocore process, with no luck. I'm not sure, bu I think the problem started after the last OSX upgrade (10.6.8).
Any ideas?
Regards,
Sandro

Hi,
Can you post back with the following.
1. The full Model No. and Product No. of the notebook - see Here for a further explanation.
2. The full version of the operating system you are using ( ie Windows 7 64bit ).
Regards,
DP-K
****Click the White thumb to say thanks****
****Please mark Accept As Solution if it solves your problem****
****I don't work for HP****
Microsoft MVP - Windows Experience

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I fixed it (for now, at least!)
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