If you switch off your PC or there is a power cut before Power Music can close down there is a possibility that the Power Music database can be corrupted.
The kind of error you might see is "arithmetic operation caused overload" or "argument 'index' is not a valid value" when you launch Power Music.
Here's how to fix the issue:
1. If you have made a backup of the songs in Power Music recently try restoring this backup.
2. If you have not made a backup try the following...
Once a month, before closing, Power Music makes a backup copy of the database.
The current database in use is [Documents]\Cambron Software\PowerMusic5\PM5jubaldb.vdb5
Rename the current database to PM5jubaldb_old.vdb5
Then go to the Backups folder [Documents]\Cambron Software\PowerMusic5\Backups
Inside this folder you will see a number of folders with names PMBackup<Date/time>
Select the folder with the date/time of a backup BEFORE the error occurred and open this folder.
Inside the folder you will find a file called PM5jubaldb.vdb5. This is the backed up Power Music database.
Copy and paste the backed up database file into the live folder - beside the file you just renamed.
Relaunch Power Music and see if this fixes the issue.