truss member not show up

I ran a simulation for a transport skid, which include both truss and beam members. When I open the displacement plot, only beam members show up, not the truss member. Could anyone know why? and how to make both element members show up?

I am using solidworks 2016 simulation.

There is no such issue when I used Solidworks 2014 simulation.

Thanks,

Helen

SolidworksSimulation