Clint, DenonLink was exactly the cause. From my Denon AVR3805, I disassociated the DVD input from DenonLink (chose 'none'), which enabled the 'DenonLink" option under tab 2 (Digital Interface settings) in my DVD3930 setup menu. I then changed DenonLink from "3rd" to "off", and then, viola! All options in all tabs are available. Very strange that DenonLink settings (in my AVR menu) affect the options under "Language Setup" (in my DVD player menu). ???? In any case, I'm glad to solve that mystery. Thanks for your input!