Hello Jan,

Please try to restore a backup copy of your project by following these steps:

▪select the project you want to work on in the Project Selection window;

▪click on the Backup... command to open the Backup Management window;

▪select the backup copy you want to restore from the Backup List and click on the Redo button.

The program substitutes the project with the backup copy and opens the Project Selection window, so you can open the restored copy and continue working.

Please let me know if it helps.