Some motion bodies can disappear during the motion animation. This means that the animation will play as normal, but without the hidden motion bodies. This can be confusing because the motion bodies will be shown when the animation is not playing.
Solution
All of the motion bodies can be shown or hidden from the selection tree underneath each Solution in the Motion Navigator. Expand the active solution, Results, Animation, and Default Animation sections in order to find the full list of motion bodies as they appear in the animation. Additional animation objects, like animation camera elements, will appear in this list as well.
Notes