Before you say, "Works fine for me", please read the post.
I've known about this for a while, but I don't think baddy has realized his little mistake yet.
The texture used in Particle_Grass is "base/data/foliage/bearGrass", which is a file no-longer downloaded since the shadows/shaders update.
So if you ever re-install the game, remember that emote will be broken.
fix it please Badspot.
Here is a fixed version if you want it:
Particle_GrassFixed.zip