If you start a new project and add an emitter at frame 1, do you still see the problem? I’m guessing no, so…
What frame are you working at? If you’ve got a 10-minute video, and are trying to add emitters near the end, it’s going to take forever — this is not the way to use pIllusion.
Instead, break up your long video into shorter clips (only the shots that need particle effects), load a clip, add the effects, then put everything back into order in your video editor.
Alan.
http://www.wondertouch.com