AC3 5.1 files don't make 5.1 DVD?

Hi Folks
I used Digital Performer to make 5.1 sound track - I bounced the project down and thus have a folder of MySound.L.aif; and MySound.Rs.aif and so on. I've looked at those audio files in a separate audio program, and the files have content and seem fine. I encode in compressor 3.5.2 using proper AC3 settings. When I burn a DVD with the AC3 file, it plays stereo. I've tried many variations of this procedure to try and find out what's going on. For example, I found some correctly named .aifs in a DVDSP Training Series book I have; I encoded them in Compressor with the same settings and the DVD is surround sound. Odd. I used STP and bounced to AC3 within STP and it makes a surround DVD. Fwiw, the playback system (receiver, player) all work fine with Dolby commercial releases.
Any thoughts on this one??
Thanks, John

still hoping for some insight on this oddity... thx, John

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