I've just purchased the Numark Mixtrack controller and installed and activated the Traktor LE software that was packaged with the controller. I first installed Traktor LE and updated it through the Service Center, then connected the controller. The light son the controller illuminate, but I am unable to control Traktor LE with the controller. I used the Setup Wizard and mapped the software to the controller (USB/Firewall Controller - Yes, Manufacturer/Device - Numark/Mixtrack) and selected "Finish" at the end of the wizard. When I navigate to the Preferences menu and in the Controller Manager section, the default controller selection is "Generic Keyboard". I can change this to "Numark Mixtrack" through a drop-down list but the selection doesn't save (i.e., there is no "Save" button in the Controller Manager, only a "Close" button), and so whenever I close the Controller Manager the selection defaults back to "Generic Keyboard". Any advice you could offer to address this would be appreciated.