i tried loading traktor pro ( which came with my S4 ) the other day, and it crashed.... nothing loaded, BUT there was a waveform in deckA..... i have tried re-installing it, using the original serial no. but it would not accept it... i have emailed NI, who told me to un-install the original file, ( CD ) and load up the demo version, via the NI web site. Then, once loaded add the serial no to the service center... but to no avail... it's still not accepting the serial no... i have lost 2 radio shows now...