I gave this another spin today and noticed that I can't pass 48khz on the dvd audio option, I tried a few settings on my Oppo and receiver but no luck reaching 96khz. I do reach 96 choosing the dts option however. Anyone else having this? Not that I lose any sleep over it, just curious.
Weird! The only thing I can think of is some older OPPOs won't pass >48k across HDMI - only analog. Probably not your issue though, since you're getting 96k on DTS.