"extract pages" greyed out (version 9 pro...but also in version 7!)

Just bought version 9 to try to just get this to work. Want to simply extract pages from a pdf document. Those and many other commands are greyed out. This is still happening in version 9 as it was in version 7 for me, though did work at some point on another mac. I checked and am not missing any updates in version 9.
Thanks...Darren