Haywire particles

When using particle effects on a scene, sometimes there are a small amount of particles coming from the top corner of the screen right when the scene starts. It's as if the particle effect was started there, stayed there long enough for a few particles to be emitted, and was then moved to the proper place. Does anyone know how to fix this problem, or if I'm just doing something wrong?

I'm not sure, but I think it's a bug in the public build. I think Simon fixed most of the particle related issues for the next release.