I am largely a reader of PDFs, but I am a scholar so I really like to be able to highlight texts and to write notes in the margins. I use Acrobat X Pro so that I have maximum capabilities for marking up documents. But since upgrading to version X, I am constantly being told that I can't save the document unless I give it a new name. this is hugely annoying and time consuming and leads to multiple copies of the same documents as I have to give it another new name each time I re-open it and put any kind of mark on it. I never have had this problem in the past and I assume it is due to some new setting that I am not aware of but I can't figure out what I need to do to change it's behavior. Please help.
