In Visual3D version 4 we have introduced a color scheme for animating forces.

Force Vectors:

The red arrow is the force on the Force Platforms.

The blue arrow is a Force Assignment (not necessarily related to a force platform) to a segment.

The orange arrow is a force on a Force Structures (e.g. a step).

The purpose was to make it easier to identify forces that were not assigned to segments.

Note that an assigned force is not updated automatically when a force platform or structure (or their signals) are modified. It is necessary to Recalc the Workspace to update the assignments.