Stopped playing Dolby ac3 sound-please helpI

I make a lot of simple DVDs and always encode audio with ac3 and Compressor. Recently I can no longer create sound with the ac3 tracks. Here are the facts:
* No sound with the viewer or simulator
* If I replace the track with an aiff track it works fine, so it is not an overall audio problem. I use a lot of audio software and it works fine
* I have built the DVD and it also creates no sound.
* I have used old ac3 tracks that worked before and still no sound.
* I have run update
* I have repaired permissions
* I have reloaded DSP and Compressor and re-did everything above.
* I have DSP 4.0.3.
Any ideas? Tell me it is some dumb, simple thing.

4.03 is the PPC version 4.12 is the universal. The studio upgrade path to universal is expired so you are at 4.03.
Another thought is to ditch the preference file for DVDSP, Compressor and reinstall pro aps suppport. These are "ball field solutions" so it is more generic than specific.
OT: With FCS2 I wonder if there will be some new promotion to get from PPC to universal.

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Stopped playing Dolby ac3 sound-please helpI

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