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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?
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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.
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See this thread for more info:
Acrobat 9 pro won't install on Sierra (MAC)
Acrobat 9 reached the end of life on June 26, 2013