Nickclk:Green/red sounds like something is muting the video - if this were that AVR600, you would get a black screen with a "HDCP failure" notice at the bottom. When you have this screen, can you get the OSD or menu of the AVR600 up? If not, the display is *likely* to be muting. If so, can you get the Oppo menu up? If not, then the Oppo is *likely* to be muting. Turning the Oppo on/off doesn't really point to any item in the chain as doing this causes the HDMI/HDCP authentication process to restart.
Yes, you can see the Oppo screen through the red or green, rebooting either the Oppo or the Arcam cures it. This is only an occassional bug now, though more so than the V+ audio. At least I'm not getting complete AVR600 lock-ups anymore.
Nickclk:With regards to no audio with your V+ box, how do you have it connected and what do you have the "audio source" setting for that input set to? Having done a little research on this, I've found quite a few theads with people recommending HDMI connection for video & optical connection for audio (with some fiddling of the V+ HDMI override settings required). In this case, the AVR600 settings would be as per Sky boxes.
Audio input is set to HDMI on the AVR600 'SAT' menu. It is only happening occassionally, but it never happened with my Onkyo, which to me suggests the problem is with the AVR600.
Everything powers on using macros on my Logitech Harmony One. I've reset them so that the AVR600 powers on 1st, then the Pioneer plasma and then the V+ or Oppo.