I have a Mac with OS X 10.9.5 and just downloaded DraftSight 2015, but the program won't open.  Whenever I click on the icon in the dock, the only thing that appears is the spinning "beach ball."  I installed a previous version of DraftSight on my Mac last year and received an e-mail message to activate the program, which worked.  I did not receive an activation message or warning after downloading the 2015 version.  How do I get the program to open?