I am using the trial version of Acrobat DC Pro v. 15.009.20077 on a MacBook Air running OS 10.10.5 with 4GB of RAM. When attempting to edit and save PDFs I have created I keep getting this error: "The document could not be saved. There was a problem reading this document (110)". I have read/write permissions on the files. I have combed the forums and have not found a solution. Any help would be much appreciated.