Yes....I have a similar problem!
Set up I have my PS3 connected to my 606 via HDMI. I have an HDMI from my 606 to my Kuro. Fine. My PS3 is set to stream Linear PCM. This means that my PS3 is decoding the HD Audio. Cool. I have used to auto setup routine on the 606 to setup the the speaker levels, etc and all seems well.
Issue I bung in The Incredibles into the PS3. Using the Movie button on my remote, I select DVD PL X Movie on the 606. So, I would now expect the 606 to take the LPCM stream and do whatever it does to create surround sound, right?
From The incredibles menu, I select Setup and then THX optimiser option. I go for the Audio test. The speaker positioning results are:
Left...................OK
Centre.............OK
Right................OK
Surr Right.......Nothing from the Surr Right....the sound comes out of my Right
Surr Backs.....Cos I have 5.1 the sound should come out of my Surr Right and Surr Left. It actually comes out of my Centre!
Surr Left..........Nothing from the Surr Left....the sound comes out of my Left
Subwoofer..... Total silence
Clearly, my understanding is missing some vital piece of information. I do get sound coming out of the Surr L & R during the movie but as far as I can tell, its the same that's coming out of the fronts.......not the surround sound experience I was expecting.