Material Billboard white in all build versions(shipping)

Hi,
I keep getting a problem with my shipping, developemnt builds. I have an objective waypoint icon using a material billboard component and this works fine in PIE but in any packaged build the icon turns into a white square. I cant figure out why this is happening and ive spent quite a lot of time on it.
Does anyone know what the issue could be.

Here is a video showing the issue.
[link text]video1

Thanks

ive tried making it a two faced material. still nothing.

anybody know whats going on

came back to this figured it out

the texture i used was the targeticon from engine content.
this showed a warning “imported package but it was never saved as an export.”
using a different texture works