No HDMI audio out option, only Airplay

Hi everyone,

Hoping to get some enlightenment here as I am at my wits end. Here's my setup:

Macbook Pro (mid 2011 era)

Belkin MDP to HDMI converter

Monoprice HDMI cable to Denon AV-1912 receiver

Prior to upgrading to Mavericks and numerous updates to my Apple TV, I was able to plug in to my Denon receiver via HDMI and get display and sound options pop up through System Preferences, no problem. Everything worked beautifully. So there is no issue with my sound card not supporting HDMI.

Now, whenever I try to connect through HDMI, I can only get the display to work. Trying to bypass the internal speakers through the Sound panel in System Preferences yields no results. My Denon receiver only shows up in the Sound Output panel as an Airplay option, not as HDMI. When I select it as Airplay, the receiver automatically switches to the Airplay (Internet Radio) source and kills the display connection it had made with HDMI.

I can't for the life of me figure out how to either:

a) Disable Airplay in my Denon receiver OR more apropos to this forum,

b) Get HDMI restored as an option in my Sound Output preferences.

Any suggestions welcomed!

Thanks,

Jeff