Hmmm - AFAIK Pioneer isn't one of the manufacturers for whom Onkyo claims full compatibility with its RIHD system, so I guess there is a signalling problem. Could be the HDMI input you're using on the TV is somehow designated as the game one, and thus that's the input the Onkyo is being told to switch to - might be worth trying another HDMI input on the TV and see whether anything changes.