Best Answer mobilelawyer , 23 August 2014 - 11:58 AM
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A couple of things to try on the AVR (perform each step and if it works, skip the remaining steps):
1. Pull the power plug for a minute and plug it back in (this has fixed my TX-NR809 when it had a pretty much identical problem a few times).
The first suggestion on your list totally fixed the problem! When the receiver is deprived of power, it goes through the set up process again for the HDMI connections, and it totally cleared up the problem. Thanks so much. That was so simple I may actually be able to remember it the next time this happens!