- What is the version of the Adobe Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the latest version 21.01.20145 installed. Go to Help > Check for Updates and reboot the computer once.
- Are you on Mac or Windows machine and what is the version of the OS? Please check for any missing/pending updates and try updating the OS and see if that helps.
Please try to repair the installation (Win Only) from the help menu and reboot the computer once.
If it still doesn't work please try to turn off the protected mode for testing (Win Only) Go to Edit > Preferences > Enhanced Security > Turn off the protected mode at start up, Uncheck Enhanced Security and turn off the protected mode > Click OK and reboot the computer. Note: Please turn on the security after testing to avoid any security risks
If it still doesn't work, please create a new test user profile with full admin rights in Windows or enable the root account in Mac and try using the application there.
For more information please check out the help pages listed below: