Please check to see if the Volumes have been installed correctly on your MAC.  You should see a listing of the Volumes under Applications. When you click the icon for one of the volumes it should open a Table of Contents which should show a listing of the lessons in that volume.  If this does not happen, please

• Open the Console Application (Applications/Utilities/Console).
• On the left side, in the Logs column, navigate to ~/Library/Logs, Crash reporter, (Look for Guitar-Leads.log or launch_Guitar-Leads.log or something similar).
• Select all the text of the log on the right side. Copy to clipboard and send to me.

A seond issue we sometimes see is that the lessons are opened by a program other than your browser.  Your browser should be the default application for our swf lesson files.  Here is a URL that shows you how to change file associations.

http://www.fileinfo.net/help/mac-change-program.html