I am a new G5 owner. I have been attempting to manually adjust the LCD brightness via the Main Menu, Function Settings, LCD Brightness setting. I highlight "Manual" and press select using the "Navigation" button, but it does not allow me to move the brightness adjustment either up or down. I've found that if I repeatedly press select, it will randomly highlight and permit the adjustment. Other than the brightness adjustment, the select (Navigation) button works fine. I realize I can adjust the brightness via the PPS and have done do by that method. Am I doing something wrong?