Solution: Please try again. Oftentimes, a coworker will have displayed a window within MYOB Plus that's used to perform a sensitive task; a number of these windows require that no one else be using MYOB Plus while the window is being used. (This function, known as file locking or Smart Conflict Resolution, is done to protect your accounting information from possible damage while tasks like backing up or importing information are being performed.) If you try to start MYOB Plus again, you'll often find that your coworker has finished his or her task and you'll be able to access the program.