I use Acrobat 9 pro to extend rights to Reader 8/9 users to add comments etc. in PDF documents, including forms. I have recently noticed a rise in the number of users who have lost the right to edit documents after saving a couple of times. Not all can have used Acrobat to save by accident, nor are they all saving copies of the original. The same documents can be edited and saved repeatedly on other Reader 9 installations. The only thing I can think of is that I have performed a registry edit on some installations in order to overcome the bugs in the loupe, typewriter and / or pan tools (cAV, set large numbers to 0) although they seemed alright at the time. Any thoughts welcome.