Hi, thanks for responding. I'm using Windows 8 at work on a government-owned PC. As I related in my posted question, I used to be able to do this, without any difficulty. Your screen shot depicts exactly how I approached the merge. I could add both open files and files that were on the LAN server in the same merge. When I started encountering this problem recently, I tried using just only open files, or only just saved files on the server, but it still didn't work. Sometimes the files are in Word, many times the files are already in pdf format. I successfully merged files for years in Acrobat Pro X, then one day late last year, it stopped working. The newer version, XI, gave me the same error. Just a cursory glance at the web shows that many, many others are plagued with this problem. This problem represents a significant loss of functionality for me. Hope there is an answer. Thanks again.
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