Did you download the latest version?
http://www.saberforum.com/index.php?topic=11988.0Are you running it with administrator rights?
Are you plugged into the emerald port? If you have sound, then make sure you're plugged into the green board. Pull the battery pack out a little further to see it.
Did you turn on your saber before plugging it in?
Are you using fresh batteries?
I'm sorry to ask all the questions, but I've never seen that before, so I don't really know where to begin.