Let me post my issue I originally posted on the Onkyo TX-SR608 thread today:
I've searched and cannot find my issue exactly. I just purchased a Samsung PN64F5500 and was excited to get ARC working with my 608 - alas, it has been a nightmare. First, when I enable Anynet+ on the TV and RIHD on the 608, I get a No Anynet+ device detected on the TV! Are not Anynet+ and the Onkyo implementation not compatible? I have a high speed 1.4 ARC compatible cable - matter of fact tried a much more expensive one, same issue. Also if I select Smart Hub on my Harmony (a function I have set up), it switches the TV to Smart Hub, and the 608 to TV/CD. But sound comes out the TV speakers, so i go to Sound and Receiver out is grayed. If I turn off the 608 and back on, I can then select Receiver and it works as it should (except for the no Anynet+ device found message) MOST of the time. So I now have my Harmony to turn OFF and back ON the 608 after the Samsung goes to Smart Hub, but many times I still have to go into Sound on the TV and select Receiver. This is an absolute PITA for something that should work seamlessly.
I HAVE NOT upgraded to the latest firmware, mainly because of the warnings that if it fails you have a dead and un-revivable receiver. The service center in Houston wants $75 to update the firmware, are clear across town, and WILL NOT do it while I wait! However, if the latest firmware update might fix this issue, I might bite the bullet. Any inputs please???