I see sowwhatyoureap's report surpassed mine in detail, very good.

I see now that the Input button on the Utility panel brings up the input list on the Viera. I can then go up and down the menu using the arrows. But other than that, my report still stands; I'm not sure why e.g. HDMI works for sowwhatyoureap's Viera but not mine. Also, using the arrows in the Menu panel does nothing (if the input menu is not shown yet on the TV).

Thanks for your hard work.

P.S. Maybe HDMI doesn't work for me, because, unlike sowwhatyoureap, I don't have cables plugged into HDMI inputs?