If you encounter this problem, there are a couple things that will fix it:

1 - Install the latest update patch for Band-in-a-Box (even if you already have the latest build).

or

2 - click on the main Band-in-a-Box folder (in the Applications folder) and Get Info (Command+I). Find the Sharing and Permissions, set the groups to Read&Write, then click "Apply to enclosed items".
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Andrew
PG Music Inc.