Midi Controller problem Behringer BCF2000

I'm using a Behringer BCF2000 to control sliders in max but I'm having some issues. I have a demo patch which works fine and all the sliders move when I use the fader on the midi controller but they have no effect on what the slider is doing. e.g. I have a fader to control the brightness of a video. when i move the fader on the midi controller, the fader moves in max but it doesn't actually change the brightness. Below is an example. If anyone could help I would really appreciate it.

Thanks

B