I can't help you. With these VT60 units the settings are not lost when the power is removed.
Did you change the input (HDMI1, HDMI2, etc) selection? Each input has its own memory for the settings.
I checked all the inputs and they all reset to defaults. I modified one of the picture modes and disconnected my TV for 5 minutes, plugged it back in and the settings are still saved. So I don't know what could have happened that all my settings were deleted.
Oh well, off to do it again I guess.