I have been sacrificing many a headaches to the altar of "please will you LG!!" for the eARC firmware update but that seems to be a lost cause. (I'm saving up for the just released Marantz 7015) My Denon AV receiver did not work at all with ARC and C8, and i'm happy to at least have the DTS through. But it is weird that my Onkyo reported DTS-HD stream before and now only DTS, this would suggest that there has been some funkiness with the ARC all along. I think i was on the 5.10.45 before yesterdays update. Perhaps now it's as it should have and we can completely for get the eARC on the 8 series...Or they cleaned the ARC side of firmware to prep for the eARC...Can't really get my hopes up anymore.No idea what was happening before, but to deal with the hear and now: you need eARC to carry lossless DTS-HD MA. It can't be done over ARC so your problem is the limitations of ARC, not any recent change. This is why eARC was created, so that lossless formats could be carried, and we don't have eARC on our TVs.