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Hi @Anna Paavola 

I hope this message finds you well. I am sorry to hear that you are experiencing issues with your Acrobat DC.

Is this an issue with a particular PDF file or with all the PDFs? Please try with a different PDF file and check. Also, please share the screenshot of the error message for a better understanding.

Would you mind sharing the version of Acrobat DC you are currently using? To check the version, kindly navigate to the Help menu and select "About Acrobat". It is recommended to ensure that you have the most recent version, which is version 23.01.20093. If you do not have the most current version, please navigate to the Help menu and select "Check for Updates", and then reboot your computer.

In addition, you may try repairing the installation from the Help menu (Windows only) to see if that resolves the issue. You can also reset Acrobat preferences to default settings as described in this article: https://community.adobe.com/t5/acrobat-discussions/how-to-reset-acrobat-preference-settings-to-defau...

If the issue still persists, you may try creating a new test user profile with full admin rights (Windows) or enabling the root account (Mac) and trying to use the application there.

Regards

Amal