To save any confusion here is your earlier post.
Ted Pustey "There was a problem reading this document (109)." 4/2/04 8:50am </cgi-bin/webx?14@@.2cd103a1>
Where is this PDF that you are trying to edit?
Make sure that you are oening in from your local hard-drive as opposed to a network/mapped drive.
Failing that, how exactly was this PDF created and how did you come by it (email?)? If you have Acrobat 5 can you open the document, choose Save As and save it under a new name and then try to opeb it in AA6?