@ Honkeyboy - when in Fragmotion, just right click on the texture and select remove alpha, then the texture will become visible. Just re-save the texture, then you'll be good to go.
@ PCSKILLER - When you export the x model, Tree it generates two seperate textures. One for the bark, and one for the leaves. The bark one is normally the one which alpha channel has to be removed to become visible.
Also, what I do is I combine the two textures into one, by putting them next to each other. Then I import the tree model into Fragmotion, and just re-asign the new combined texture to the model. Note that if you do this, that you will have to re-position the texture on the model with the UV mapper again. Then just export as an x model, and import into GG.
One thing I have also noticed about Tree It models, they look really good in GG, but they really impact the framerate. I got no idea why, because they're not really high-polly models at all. Weird.