I had my DTC-9.8 processor replaced under warranty for this exact issue. Discussed the issue here starting at post 38.
http://forums.audioholics.com/forums/showthread.php?t=47928&highlight=integra&page=4
After reading that whole thread over, it seems that I didn't actually describe the HD audio problem's symptoms. I think I did in the huge AVS thread but good luck finding a specific post in that thread. It would be like finding a needle in a stack of needles.
Anyway, when sending a signal as PCM, the receiver would function properly regardless of which audio format was selected. When I set the players to bitstream, normal DD and DTS would function properly but if I switched the disc menu to output an HD format, I received only silence. The processor simply would not recognize the HD format as a bitstream signal and no sound of any kind could be heard. If I left all settings alone and switched the disc menu back to a standard format, it would work properly. I have my replacement unit now but I have never heard what the cause of this problem might be. The new unit played the HD audio tracks in bitstream perfectly the first time I tried and displayed the HD titles on the display as it should.