Sadly, neither further experiment was a success... running the video output of the FMP directly into the Onkyo and hooking the Onkyo to the switch, then the switch to the projector, or running the FMP 4k through the switch then through the AVR worked. I do think a firmware upgrade either from Sony or Onkyo could probably solve the issue, but I'm not at all sure it will happen.
So, the manual switch with one signal coming directly out of the FMP's 4k port and the other coming out of the HDMI signal from the Receiver appears the only way to dependably get an FMP signal. The other items on my Onkyo work fine plugged directly into the receiver.
I feel much better about getting a firmware fix for the audio, especially after we all pester the fool out of them.
Last edited by billqs; 08-18-2014 at 12:31 AM.