8 nit pixellize + particle effects

Hi,

I´ve been trying to combine 8 pit pixellize postprocess effect (YouTube with some particle effects. Strangely when use for example fire from starter content, there is a light effect, slight heat distortion but flames or smoke is vissible

This the picture with post process effect turned on. You can see the light and distortion, but no smoke or flames.

The same scene with post process effect turned off.

Any help would be appreciated.
Thanks