OK - it's taken hours, but I used the original tv remote to navigate to the hdmi (HDMI1) input that I"d plugged the roku into and got roku set up. I programmed my logitech 510 harmony remote to control the roku ... the only problem is now - I can get the sound out of the TV, but not out of the AV receiver with the speakers. My DVD player just has an hdmi cable going to the back of the TV set (HDMI 2) and since I didn't set the system up, I"m not sure how the audio is set up. Do I need to run audio cables? From where to where? Any advice most appreciated!

My guess is that you have to run a couple of audio cables (red and white) from your roku to the proper AV inputs plugs on your receiver. Then make sure your logitech is programmed so the receiver controls the audio.