To clarify the behavior for those unfamiliar..
It's not the codec change.. It's the output config..
And not unique to Onkyo at all.
For example... If you are listening to 5.1 broadcast and switch to a 2 channel broadcast...
If you have 2 channels listening mode set to stereo, it will click as it switches over to 2.1..
If you have the 2.0 preset set to DPLIIx, no click as it stays in 5.1....
This is a wholly different issue the AVR's x008 vintage and earlier exhibit..
They would click on any change, including a ff or rewind on DVRs, switch chapter, pause, etc.... And you would also get small drop outs..
That is most certainly fixed.