The built-in screen capture for the mac has limitations. It must capture the
whole screen, it will only work in black and white mode (no shades of gray)
and ti cannot capture pulled-down menus.
There are other screen capture programs. Try Black Box, which you can get by
anonymous ftp from sumex.stanford.edu. It is more than a screen capture
utility, but that is one of its functions.
Ben Jones, BioQUEST