Screen saver options disabled

When I go into Control Panel - Personalization - Screen Saver the "Wait" time
and "On resume, display logon screen" options are grayed out on all screen
savers. This is a new development - when I installed Vista I was able to
change these options. They may have gone gray during a recent Windows Update
but I don't know for sure. Any help in getting these options back would be
appreciated.

Thanks!
Richard Wilder