Which parameters will affect modeling of Langrangian Particle Tracks?

I’m really interested about the function of Langrangian Particle Tracks. But there seemed to be some problem when I tried to use this function. When I added some drifters to track the trace,and click on ‘show IP’, there was no initial position showed in the view plan. But the particles were surely added into the model because the number of drifters was changed. Then I ran the model to see the result, it said ‘bad drifter file’. I activated salinity, temperature, cohesive and non-cohesive these four module, is there any other parameters will affect the simulation of drifters and causes that problem?

Any answer will be appreciated.

I reload the model and finally see the result. :stuck_out_tongue: :stuck_out_tongue: :stuck_out_tongue: