sony BDP-S570 and the wizard of oz blu-raly

[MacinMan]

Hey guys,

I was watching the wizard of oz limited special edition blu-ray on my S570 and i noticed the vocal track cut in and out while the sound effects and music played. This happened with scenes of the wizard and at the witch's castle. the mouths moved, but no voices. The player has the latest firmware to date. also for audio the player said dolby digital 1.0
so i am not sure if the disc and player are incompatible etc. the disc plays ok in my panasonic but i should try it again just to check. Also the panasonic has a dialog enhancer for audio, can't find one on the sony. Anyway does anyone have any ideas what's going on? or has had this happen.

Thanks

EDIT
I think I was the one that goofed here, apparently there are no voice track on the dolby mono tracks for english. apparently that got selected by accident. I tried this on the panasonic and the voices went away there too. I guess it's a disc mastering issue it says it has tracks but nothing actually comes out audio wise.