I don't want to take the thread off topic, but I seem to remember that some 605's had a problem related to something like this. I don't own the 605, but I DO remember hearing something specifically about bitstream audio and the 605.
If you don't know what I'm talking about, you might need a firmware upgrade for your 605. Do some searching on the internet, or contact Onkyo w/ ur serial number etc and they should be helpful.
My 1.1/1.1 upgrade is going as I type this; here's hoping it IS actually going to 1.3
Here is the link: http://onkyousa.com/605firmware_replace.cfm
I haven't heard of individual titles not passing THD for bitstream. The AVR firmware update sounds plausible.
No 1080p/60 fix!
Oh well, I'm going to watch Flags of our Fathers and Letters from Iwo Jima one after another after I get the Mrs. plastered on White Zinfandel tonight.
We watched Spiderman SD this eve. I know it's not HDM but it sure looked good, though. Kirsten Dundst...Yummy!