Sorry, don't know. It always works for me. Don't use often, but when
used it works. Try changing the "settings" at the upper left of the
dialogue box (Acrobat Pro Ver 8). No obvious reason why these options
should be greyed out.
I do not see Menu: Tools > Print Production on Adobe Acrobat Version 8.
Check again in Adobe Acrobat Pro's Help how to make this work. Perhaps
there is a switch to turn it on. And could check with the Adobe support
forum why Adobe Acrobat Professional is not working.
For you, I used Google to search for "advanced printing tab greyed
acrobat professional" and found
http://www.acrobatusers.com/forums/aucbb/viewtopic.php?id=757. Sort of
related. Suggest you search more postings there or ask there.
I also see
http://www.adobe.com/products/acrobat/faq.html at the bottom
of the page crop marks discussed.
--rms
www.rmschneider.com