I have same problem. I have licensed XI PRO product. I can't open XI PRO since Monday morning. I have tried all the solution suggestions. But I can not use the program. It certainly does not open. After a long time I see "DDE server error". Emergency solution please.
I started having the same problem yesterday, Acrobat will not open PDFs and eventually I also receive the "DDE server error." I'm running Windows 10 Pro v1709. My system's last update was on 3/13/18, well before this issue surfaced.
I have also tried uninstalling and reinstalling Adobe Acrobat only to receive an error indicating my serial number is incorrect, which it isn't...
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Sorry for the delayed response.
Are you still facing this issue? If yes, please try following troubleshooting steps:
Make sure that the application is not open to the Task Manager.
1-Go to the Task Manager by pressing Ctrl+Alt+Del.
2- Go to the processes in Task Manager.
3- End all processes related to Acrobat.
4- Restart the computer.
5- Launch Acrobat again.
If that doesn't work, Repair the application. Open Acrobat and navigate to Help menu > Repair installation. You may refer to the following thread for the same: Acrobat failed to connect to a DDE server (Installation & updates)