Database upgrades can take several hours to complete for large databases. The upgrade time depends on the size of the database, the quantity and type of data, and the version of software before the upgrade. DO NOT STOP the upgrade once it has started even if the Viewer displays a Not Responding message. A dialog will appear once the upgrade completes.
The Viewer may take a few minutes to open the first time it is started after an upgrade while final updates complete. During this time, do not force the application closed.