Acrobat runtime error in windows 11 when multiple documents open

Hi @nicholas3118270948r9 

Hope you are doing well and sorry to hear that

Is this an issue with a particular PDF file or with all the PDFs? Please try with a different PDF file and check. If the file is stored on a shared network/drive please download it to your computer locally and then try again.

What is the version of the Acrobat DC you are using? To check the version go to Help > About Acrobat and make sure you have the recent version 23.03.20244  installed. Go to Help > Check for updates and reboot the computer once.

Also try to repair the installation from the help menu (Win Only) and see if that works.

You may also try to create a new test user profile with full admin rights in Win or enable the root account in MAC and try using the application there and check.

If it still doesn't work, please remove the application using the Acrobat cleaner tool https://www.adobe.com/devnet-docs/acrobatetk/tools/Labs/cleaner.html  , reboot the computer once and reinstall the application using the direct link
https://helpx.adobe.com/acrobat/kb/acrobat-dc-downloads.html

Regards
Amal