So, are you trying to get the DTS-HD to play or just the DD? How do you have player hooked up to your receiver? If using 5.1 or 7.1 analog outs you need to go into the setup menu of player and turn on the Multichannel outs and you can set the various audio codecs to how they are output. Like either setting DD to bitstream or PCM.
Let me know what your settings are on Panasonic and how you have connected to receiver.
JVC RS600(Calibrated with Chromapure using an iD3), Stewart Cima Neve 2.35 115" diagonal screen, Lumagen Radiance XD, Darbee Darblet, Denon AVR-X7200WA(7.6.4), M&K Speakers, 6 ported 18" subs powered by 3 inuke 6000dsps, Roku 4, Panasonic UB-900 UHD blu-Ray player, HDFury