Possible problem here, can someone else try it.
Load a terrain and use an eco system, any will do. Then load an Aplha plane and put whatever picture you want on it and set it as a bill board....What do you get?

I get a billboard with an eco system on it, the picture I put on the Alpha plane can be seen in the material editor as a mapped picture, but my Alpha plane doesn't show the picture, just the eco????
My Alpha planes were working until I put the update in, can someone try it or have I missed something here and having a blond moment...[no offence to blonds, LOL]

Injustice will be avenged.
Cofiwch Dryweryn.