Morton, you hit on something here. When I first enter the cockpit, if I pan over to the FMC, I am able to press the buttons to enter data or change screens. But once I select Presets, there is no change on the display by hitting the buttons. Changes still show up on AirFMC. This is any Preset, not just FMC. If I change aircraft, and go back to the 733, as long as I don't use the Presets, I'm able to manipulate the FMC by pressing the buttons. Chase view, 3D view, as long as I don't select Presets, I'm ok. Any thoughts?