Printing problem with Acrobat 8 Professional

Have just upgraded to Acrobat 8 Professional, and am finding that some (but not all) Acrobat files simply will not print (no response from the printer, not a sound) when "sent" to the printer -- and these are routine documents like C.V.'s that I've been printing up for eons. All the settings seem to be right, and all other printing works fine. Help!