Rendered animation motion not the same as in preview

Hi,

I made a simulation of a hexapod in wich the movement of the top platform seems to be caused by the extension and cotraction of the actuators (see hexapod screen.avi).

But when I render the simulation the actuators dont move anymore. (see hexapod.avi)

Any idea what causes this?

Thanks,

Janeau

SolidworksPhotoview 360