Acrobat DC, Microsoft Office 365 ProPlus (Word 2016 MSO 32-bit). Switched from Acrobat Pro XI to Acrobat DC today. Trying to combine five Word documents into one pdf. Four of the five docs are nearly identical and created from the same template within two days of each other. Round 1: first three docs on list had "Error during processing (file skipped)" messages and last two processed without problems (2/2 split on the four identical files). Round 2: converted the one different file (first one on the list) to a pdf by printing from Word and tried combining again. Pdf processed without error, next three on list (including one previously processed without problems) had errors, last one processed without problems. Round 3: converted one of the previously unsuccessful identical files to pdf, tried again - file types in list were ordered pdf, doc, pdf, doc, doc. The two pdf files and the last doc processed without problems; the other two docs had errors. Just for the fun of it, Round 4: put the two Word docs previously converted to pdfs at the head of the list, as docs, with the rest of the list as before. So doc, doc, pdf, doc, pdf, doc, doc. Four errors: all of the docs except the last one. So pdfs combine without trouble, one doc (virtually identical to three others) never had errors, one doc went from not having errors to having errors, and three docs failed every time. Since the program doesn't specify what kind of error was experienced, I don't know why some docs succeed and others don't.
Acrobat DC, Microsoft Office 365 ProPlus (Word 2016 MSO 32-bit). Switched from Acrobat Pro XI to Acrobat DC today. Trying to combine five Word documents into one pdf. Four of the five docs are nearly identical and created from the same template within two days of each other. Round 1: first three docs on list had "Error during processing (file skipped)" messages and last two processed without problems (2/2 split on the four identical files). Round 2: converted the one different file (first one on the list) to a pdf by printing from Word and tried combining again. Pdf processed without error, next three on list (including one previously processed without problems) had errors, last one processed without problems. Round 3: converted one of the previously unsuccessful identical files to pdf, tried again - file types in list were ordered pdf, doc, pdf, doc, doc. The two pdf files and the last doc processed without problems; the other two docs had errors. Just for the fun of it, Round 4: put the two Word docs previously converted to pdfs at the head of the list, as docs, with the rest of the list as before. So doc, doc, pdf, doc, pdf, doc, doc. Four errors: all of the docs except the last one. So pdfs combine without trouble, one doc (virtually identical to three others) never had errors, one doc went from not having errors to having errors, and three docs failed every time. Since the program doesn't specify what kind of error was experienced, I don't know why some docs succeed and others don't.