No surround from games on XBOX 360
Hey all, I'm late to the party on this receiver. (SC-63)
I picked one up and finally got around to hooking it up.
Everything seems to be working fine minus one weird issue.
When I try to play games on the XBOX 360, there's no surround sound. The reciever shows it's getting a 5.1 signal (speakers light up on the front display), but there's no sound coming out of my rear speakers. XBOX is set to surround output in settings and it's a direct HDMI cable from the XBOX to the SC-63. I tried turning on the components in different order, changing the 360 from surround to stereo and back, just to see if it was some sort of odd handshake, but no dice.
PS3, blu-ray player, and Apple TV are all working fine. This is the only one acting up. If I were to guess, the XBOX 360 is at fault, but I thought I'd hit up people here to see what they thought.
Or should I hit up the 360 forum for this question? Thanks for any and all ideas!