I got to a gig last night, opened up my laptop and found that my all the commands in my mapping for my VCI-100 had disappeared in the Traktor settings window and none of the controls where working. I tried to reimport the .tsi file but nothing happened. Luckily I had a USB so played out on CDJs but was such a hassle.
I sorted the issue, I think it was to do with the fact that I for some reason had two copies of Traktor installed on my computer and it was getting confused.