Dolby Digital Not Decoding Properly

I have an Apple TV with the latest software. I am running the output via HDMI to a Denon 1909 AVR.
The Denon does not automatically recognize when dolby digital 5.1 is coming in like it does with other sources, however, I can see that the input is 5.1 and can change the receiver so it is in DD or DD EX modes. When not in DD or DD EX modes, everything is fine. However in DD or DD EX modes, the sound is good except for one very important piece - no dialogue is coming through - like it is missing a channel or something.
I have tried switching HDMI cables with no change.
DD 5.1 works perfectly from Dish TV, Blu-Ray and DVD sources, just not from Apple TV.
I am using itunes downloaded HD TV and SD movies that specify DD 5.1.
Anyone have any ideas on how to fix this?

I also have just recently purchased Apple TV and am running it into the VCR port on a Bose V30 system, I have decided to use the component and optical ports on the Apple TV running into the back of the Bose surround system. I get Dolby 5.1 through Bose off my SKY HD and also PS3 using optical but not through the Apple TV. I only get PCM, sometimes even no sound at all, although once a movie or music running if I flick between audio sources I do eventually get sound. I wanted to know if anyone else has had this problem with this setup. I'm unsure at the moment how many movies rent or buy in i-Tunes are actual Dolby presentations? Does anyone know how this is illustrated in the store?
Thanks in advance

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