Reply to vci 100 se crossfader problem

I have a quick question regarding the crossfader. Before, when i move the crossfader slightly it would move in that direction slightly, but now it only moves to the middle, far left, or far right.

heres a video to help further explain:
http://www.youtube.com/watch?v=hTH1KZ67gZc

Is it a setting problem? or hardware problem? .. any solutions would gladly be appreciated