I am trying to bookmark a 377 page pdf file. None of my bookmarks are being saved when I save the file. When I close and re-open it, the original bookmark is there (even though I deleted it) and none of my new bookmarks are there. I have never had a problem before and have been using my Adobe Acrobat XI to bookmark many documents and files. Any idea why they are not being saved? Interestingly, the highlights and comments are being saved.