Hi All, I just want to share my fix for Traktor activation, which worked for me. I recently purchased the Numark Omni Control and installed Traktor LE (Mac). When I tried to activate Traktor I would get stuck in the Service Centre's "infinite loop" and was unable to activate the program. I downloaded Native Instruments Service Center 2.2.0 for Mac OS X from here: http://co.native-instruments.com/index.php?id=freeupdates#NI_Service_Center and installed the program straight up (no uninstall of the previous Service Centre etc). The new service centre loaded, requested my details, and successfully activated my Traktor. For some reason the version that came on the Traktor disc with the controller just did not work. Hopefully this helps anyone else having the same issue!