I've spent hours on this and I simply cannot get it to work.
I've set up some bugs crawling over a mesh following your youtube tutorial, doing the same. It works well in popcorn but in unity the particles are not in the right place. Yes, I'm using the projection childed under a localspace.
I've attached 4 videos. The first shows the effect with projection in popcorn. The second shows the same in unity. Then to show that the mesh is actually correct, I removed projection and turned off velocity. That way it still samples the spawnposition. As you can see, those tow videos Do match. So why doesn't projection?
Projection in Popcorn: https://drive.google.com/file/d/0B3t1VDbLkxufb0FkTVQ1LTBmM1U/view?usp=sharing
Projection in Unity:https://drive.google.com/file/d/0B3t1VDbLkxufNmZoX2ktMVg3Z2c/view?usp=sharing
Position in Popcorn: https://drive.google.com/file/d/0B3t1VDbLkxufQTlEMUR3Y0h0Wkk/view?usp=sharing
Position in Unity: https://drive.google.com/file/d/0B3t1VDbLkxufNWxMb2Y5akl4NkU/view?usp=sharing
I'm using popcorn 188.8.131.52081.