Help! I just hooked up my 509 and all my devices are working properly except for my cable box. When I choose to watch my SA Explorer 8300HD DVR for some reason the screen will flash pretty often and random. Audio is not effected during the times the screen goes blank. All my other devices work (ps3,360,boxee box), and I have tried swithing the hdmi input and no luck, i get the same problem with my dvr on each hdmi input. Is it an HDMI setup setting? This is really annoying, watching tv is not possible like this, I do not want to resort to connecting the hdmi from my box to the tv, and using an optical from the box to the receiver for audio, I would much rather everything run through the hdmi like it should. It is really strange, the box has worked with every other onkyo hdmi receiver I have used, i'm almost certain it's a setting with the receiver. HDMI Ctrl, HDMI Through, and Audio TV out are all set to "off" in the HDMI setup. any help would be much appreciated.
Edit: i should mention I updated the receiver via internet, as soon as I turned it on for the first time before I set anything up.
Edit: never mind, it seems it is indeed the SA Explorer 8300HD that is the problem, I switch out and tried another box and it is working fine. Gonna put the dvr back and see if it works, crosses fingers.