Particles won't apply shaders correctly during in-game rendering!!

I met this crazy problem and have no idea what's going on totally...
I was trying to build a coin spraying particle system, and made the particle texture like this (a PNG file):


I set the material shader as Particle/Alpha Blended, tinted the coins with 2 colors randomly, and everything works fine in the particle simulation:

SCENE VIEW:

GAME VIEW:


BUT the material is rendered like this as soon as entering game-play mode:


I've tried all means I could think about, including:
- Set the texture background to black and save as .jpg
- Set the Alpha in grayscale in the texture import window
- Set the shader to Alpha Blended Premultiply, Transparent, Transparent Cutout, etc...
And finally I found no shader setting is applied to the particles in game-play rendering mode, no matter what shader it is...

I'm using Unity 5 and I've googled for over 2 hours without any helpful solution.. Can anyone help me please? It's driving me mad!

 

I am having the same issue and it is driving me crazy, I have tried setting the material to every single available option with no luck, everything still shows up as a square still for me!

 

Can't believe I'm not the only one...Hopefully this is not some kind of bug

 

I've found the problem - I'm such an idiot. I accidentally changed the shaders of all child renderers of the turrent in my code for highlighting, including the particle system. Hope this can give you a hint. =]