Please provide the exact dot version of the software & OS installed at your system .Also check whether is there any update available for the software after going through "help > check for updates "
Follow this thread to reset the preferences for the Acrobat software :- How to reset Preference settings in Acrobat.
Would like is this happening with all files or with certain one.
Are those files are on network , if they are then would request you to please save them to local drive & then check for the same .
Also the name of the application using which documents originally created.
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I had the same problem on a Windows 10 64 bit machine running Adobe Acrobat Pro DC. I noticed it only happened when my user was logged in to the machine. If I logged in and tried the same thing it worked fine. Assuming it was profile related I went to
C:\Users\PROFILE NAME\AppData\ and deleted the Adobe folder out of all three subfolders. Local, LocalLow, and Roaming. I'm not familiar enough with which one does what, so I just had it recreate all of them. That fixed it for me. NOTE, uninstalling and reinstalling does not seem to get rid of the settings in the Profile so that doesn't help. Also, if you cant find the APPDATA folder make sure to turn on "View Hidden Files".
Hope this helps.