Ken,
It sounds as though when you choose 'Load Library', the Finale preferences are looking at the User area. The Readme instructions state to place the Library into a common folder, this is at the HD level for Mac users. Finale should automatically copy any changes here to the User area. Try opening Finale, selecting Program Options from the Finale Menu. Then select Folders. you may need to check the box for Libraries, then click on the Library button and navigate to that common Library folder.
One thing to remember about 10.7 is that some User level folders and files have been hidden. To view these hidden files use the Go Menu >
Go To Folder > type '~/Library' (without the quotes). Let me know how things go and if you have any questions.