Reply to Really Strange - Master Ouput Now Coming Through Headphones

I have a pioneer DDJ-SX and been using it for weeks with Traktor 2.6. Today I implemented my Traktor f1 with a new mapping in with it. Suddenly when mixing the master was coming through the headphones even when I had not toggled cue. I tried disconnecting and re-importing my original mapping without the f1 and it didnt work. I'm not sure what ive done or if im just being an idiot and missed something.

Its not a hardware problem as I tried it in SeratoDJ and it works fine.

Any suggestions :S?