The Repair Database command is used to attempt to repair a project database that has become unusable due to crashes, multiple errors, or other irregularities.
This command can take a long time to run and is intended to be used as a last resort before restoring the database from a backup. Only run this command if you have been instructed to do so by Design Master support.
To repair the database, go to
Ribbon: DM Plumbing->Utilities-> 
->Repair Database
Pulldown Menu: DM Plumbing->Utilities->Repair Database
A Design Master dialog box will appear that briefly explains the process and possible outcomes.
Press the Yes button to attempt the repair.