Problem with pathlines
 

Hello,

I am trying to model the flow of solid particles in an air. The problem is that when ever i try to solve the model as unsteady case i am not able to view the particle tracks(only particle are shown as points), whereas for steady case particle tracks are readily available. I am not able to understand why it is so.
Could anybody point out or suggest whether there is some problem in my modeling techniques or post processing or this feature is not available under unsteady case.