Particule System Activation / Deactivation

Hi,

When I deactivate a PSC via DeactivateSystem(), if I activate it again via ActivateSystem(), nothing is shown on the screen.

When I attach the PSC to pawn, I can see the effet, I deactivate it, and reactivate and nothing is shown.

What did I miss?

My goal is to set some particules when a powerup is active and deactivate the effect once is not active and reuse the PSC if the powerup is activated another time.

Thanks,