Did some digging through other message boards and found the solution.
Apologies ahead of time if this question has been asked in any form beforehand. I'm new to this forum and haven't properly had a chance to look through the various discussion already posted.
I own a Vizio E65-E1 and a Sony STRDH770 receiver. I have my receiver connected to HMDI 1 on my tv and while I have no problems at all with my theater system, my PsPro is unable to display in 4k resolution, it advises me that 2k is all that is available. However, when the PsPro is connected to the tv directly via HDMI 1 it states that 4K resolution is available but I cannot get audio from my receiver, regardless of the HMDI port it is connected to. (yes, I am utilizing the ARC HMDI port on the receiver and CEC control is enabled on the t.v.)
Is there any work around for this so that I can get the 4K resolution from my PsPro and still get surround sound audio from my receiver?
Thanks ahead of time for any and all advice offered.

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