Well, it might be a good idea to actually use a decent comp resolution. Yours looks tiny like 200 x 200 or something and inevitably this may not work with that plug-ins internal algorithms and the particles get clipped away or interpolated into a barely recognizable transprency moosh.
Hi Mylenium and Nexahs1188,
Thank you for your help, my comp resolution is 1080 x 1080 pixels, so it shouldn't affect the plugin working. I'm using After Effects CC 2017. I'm baffled, to be honest, I'll keep trying to trouble-shoot.
Thank you for your help, very kind of you to both respond,
Try restarting your machine. Creating a brand new project, brand new comp, brand new (layer-sized) solid.
Apply the CC Particle World effect.
Move forward in the timeline.
Do you see particles then?