Have you tried a network reset or processor reset? Both can be found in the 2015 Denon owner's FAQ
www.avsforum.com

The "OFFICIAL" 2015 Denon "S-series"...
The "OFFICIAL" 2015 Denon "S-series" / "X-series" AVR Owner's thread + FAQ (HDCP 2.2) 2015 Denon AVR models ---> S510BT/S710W/S910W/X1200W/X2200W/X3200W/X4200W/X6200W D&M USA should be making an official announcement mid June regarding the new 2015 USA Denon lower level AVR models...