Re: Onkyo TX-NR709 HDMI hanshake issue
I have a similar, but not as serious problem with my Yamaha AVR. It won't pass a handshake backwards from the PJ to the BD player, so 24p wouldn't work. A direct connection fixed this problem. It meant I had to give up the lossless audio codec, but fixing the 3:2 pulldown judder was more important, to me.
I suggest you take the AVR out of the video chain. If your TV does not have enough inputs then you may find an HDMI switch that passes the handshake. The advantage here is that they are cheap enough to experiment with.