Credit for this goes to one of our forum users "Kgnos"

Sometimes even if the font is installed correctly on the Mac OS Band-in-a-Box will lose access to the font due to a corruption in the font cache. This can be solved by flushing the font cache via the terminal.

To clear the current user’s font cache, first quit all running applications (otherwise, you may see font oddities after using the command), then open Terminal (in Applications -> Utilities) and run this command:
atsutil databases -removeUser

If you want to remove the font cache for all users, use this command, and provide your admin password when asked:
sudo atsutil databases -remove

Once you’ve cleared the caches, you should stop and restart the ATS server with these commands:

$ atsutil server -shutdown

$ atsutil server -ping

It will take a second or two for the server to restart, but when it does, you should be good to go. If anything still looks odd, a logout and login should take care of any lingering issues.