I second the motion, Mr. Maller, he of the UAV Grief Counseling Fame. (Edit: That TJ keeps his metal and we give him an asterisk.) I was talking to a colleague the other day about the HDMI specification and it is (as we've seen) a bidirectional protocol -- in other words the GH4 "knows" (for some value of "knows") what device it is connected to and modifies its behavior based on that. Unfortunately because HDMI claims to be an "intelligent" or "smart" protocol, it falls under Johnson-Laird's Sixth Law: Any device with "intelligent" or "smart" in its name is not. If you have the DMW-AVC1 cable connected as you describe above, what's on the other end of the cable, Steve? Nothing? Andy.