Error message at program start: "A technical error occurred."

1. Make sure that GMG ColorProof is completely closed. So click on the GMG ColorProof icon in your Windows taskbar and select Shutdown.
2. Start your file manager.
3. Enter %appdata% into your file manager's address bar and confirm by clicking Enter.
   
4. From the displayed directory, delete the folder GMG GmbH & Co. KG.
5. Navigate to the parent directory AppData (now without "%").
6. Open the folder Local there.
   
7. Delete the subfolder GMG_GmbH_&Co._KG (now with "_").
   
8. Click the Start button on the left of your Windows taskbar and enter ColorProof.exe.config. The file location will be displayed.
9. Click on the displayed folder name to open it in your file manager.
10. Select the file ColorProof.exe.config and rename it to OLD_ColorProof.exe.config by right-click > Rename .
    
11. In the same folder, select the file ColorProof.exe.backup.config and rename it to ColorProof.exe.config by Right-Click > Rename.

GMG ColorProof should now start without any problems.