Alright, before I get into all the questions I have regarding the functionality of these new receivers (specifically the way they deal with matrixing two-channel/one-channel signals), let me provide an update from over the weekend...
So as I reported some time back, it seems jiggling the HDMI cable around in the 605's HDMI OUT port seems to have brought the OSD back -- but knowing I was going to check my system's settings over the weekend (it ended up being yesterday), I ensured, once more, that the cable was as secure as possible at the back of the AVR (even, at one point, sliding a 9V battery under it to wedge it solidly in the little cutout in my entertainment center where the cables pipe in; I decided against that after I considered that the receiver puts out a lot of heat and could do something terrible to that battery back there).
When I began checking my 605's settings via the OSD, the menus came up in the beginning -- but after a few moments, I began to get that slight twitching on the screen, which eventually lead to those weird green lines flashing through the menus. It didn't render the OSD unviewable, but it was annoying trying to see the settings while the screen twitched and flashed with that weird interference/distortion every couple of seconds.
Obviously, something still isn't right with the Onkyo's HDMI OUT port (or the cable that's connecting it to the TV), but what does it sound like? Does this weird "flickering" on the screen with green-colored distortions indicate the PORT itself is going dead, or the cable is bad? Or is it related to the "tugging" on the port because the cable is so heavy, as I thought it was?