I am sure gonk will be along soon to provide the definitive answer to your question (I mean that with the greatest respect, gonk), but in the meantime: Are you trying to play a DVD with at least 5.1 DD? Unless I am mistaken, even with the center surround turned on, the icon for the speaker won't show until there is something going to the rear surrounds, because otherwise there is nothing for the 1050 to process into the center surround.

Go Cowboys!

Mike (in Stillwater)