When QuickBooks Database Manager doesn't start, the message QBDBMGrN Not Running On This Computer appears, which stops multiple users from accessing the database.  Incorrect installation, corrupted files, or disabled services can all cause this problem.  In order to fix it and restore correct database operation, you might need to update QuickBooks, restart services, or fix the installation. For professional advice and assistance with QuickBooks, call 1.855.738.2784.