Custom Transparent shaders not working (defaults do work) (example inside)

I'm writing a little blast shader that is supposed to go off when you near the ground. This is what it is supposed to look like:

However, this is what it actually looks like:

If you look really close, you can see that the effect is only drawn over the lander. In fact, it draws over random objects at random angles. I know why this is, because of the draw order, but my shader contains the right code to solve it.

 Tags{ "Queue" = "Transparent" "RenderType" = "Transparent" "IgnoreProjector" = "True" }

         ZWrite Off
         Blend SrcAlpha OneMinusSrcAlpha

Inbuilt unity shaders (for example this additive particle shader) works just fine

(not the prettiest example, but it gives the right impression)

I tried random custom shaders from the internet, and they all give the same problem, even though they work in their examples.

Any ideas?

(using Unity 5.2.0f3 personal)