I had Cox install a CableCard this past weekend, and after a few hours futzing with the audio, can report success. Somewhere between fiddling with input settings on the Denon 4306 and realizing I needed to turn the speaker setting to "off" on the Pannie (with no internal speakers, I'm not sure why the default is "on," but maybe that's just me...) I must have switched the setting on the input I was using on the Denon from Opt1 to HDMI1. Fortunately I noticed it before my head exploded or I embarrassed myself with a tech.
I felt a little less like an idiot later when, after switching inputs from the dvd we were watching (Alias, season three--never watched it while it was on and we're catching up now) back to TV, the audio stayed mute. Switched settings again, switched things off (albeit briefly), futzed, fiddled, started to mutter, then switched the settings again: lo and behold, audio appeared, all nonchalant, acting like it wasn't even late or anything. I'm wondering if there is a handshake thang goin' on here, and that I may have had it set up correctly to start with. Anyone else notice such oddness?
I can also report the onboard TV Guide works quite well in my limited experience with it, and that I even prefer it to the settop box guide due to the onscreen preview window. Channels appeared with an hour or two after setting it up, and by the next morning detailed info was populated.