Cross DJ Demo/MIDI controller connection problem

Hi,
I'm trying to try out the Cross DJ software using the demo version (mac).
I can't seem to have my MIDI controller (Hercules DJ Control Steel) respond/function properly with the demo version. When going to the Cross DJ software preferences>MIDI, the software recognizes my controller, but I can't use my controller to play and mix tracks.
There is a small lock icon next to all controllers in Cross DJ Software preferences>MIDI, not sure what it means.
Really want to buy the software but need to get it sorted out before.
Impatiently waiting for advice : )
I'm trying to try out the Cross DJ software using the demo version (mac).
I can't seem to have my MIDI controller (Hercules DJ Control Steel) respond/function properly with the demo version. When going to the Cross DJ software preferences>MIDI, the software recognizes my controller, but I can't use my controller to play and mix tracks.
There is a small lock icon next to all controllers in Cross DJ Software preferences>MIDI, not sure what it means.
Really want to buy the software but need to get it sorted out before.
Impatiently waiting for advice : )