BBM: All folders [and songs] missing

I created a new project, using a copy (“Save Project as”… Open etc)
I kept the Default content as well.
I spent a few hours adding about 40 folders, mostly empty, above the Default Content.
I titled the folders by year-Songwriter. (example: 1909 Irving Berlin)
I added added about 10 songs spread out some of the folders.
I saved.
When I opened the project… there were NO folders and No songs. (there still are drum sets)

I did all of this within the BB Manager software [not in the finder]

On a MacBook Pro OSX 10.10.4

Does anyone know how to restore my folders and songs back into the project.

Solved!!! Using a Comma or period in a folder name in BBM crashers the folders upon re-opening!!