Check the HDMI settings in the player then, there is probably a different setting for CDs and it may have to do with how the PCM is output over HDMI. CDs and DVDs are handled differently, which is likely why you see this issue only for CDs even though I believe the same DACs are used for both CDs and DVDs. I never used HDMI for audio with my 980, only analog, so I don't recall the exact settings that are available. I would also connect up the 2ch analog and verify that it plays correctly.