Agree with Xenon-something is not right. Can you confirm what SW rev your 975 is running? (push "INPUT" and "MUTE" simultaneously and read it off the front panel). If your 975 is a bit older maybe it needs a firmware update. If that is not it, it's probably time for a call to customer service.
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975/7075/SMS-1
Aperion Verus Grand Towers & Bookshelves, Verus Forte Center, Infinity Surrounds, Ultra-X12
Oppo BDP-203, XBOX360, Xbox One
LG 65" OLED
RR2150 w/Klipsch SCR-2