I'm using Adobe Acrobat 9 Pro on a mac. For some reason all of a sudden I can't access bookmarks for my documents. I don't believe that I've changed any settings, but when I click on the bookmark icon, nothing happens in old or new PDF files. I've recently updated my OS to Sierra from Mountain Lion, could that be it?
It shouldn't cause such an issue, but your OS is not compatible with your
version of Acrobat, which might be the reason for all kinds of problems.