Palm trees glow

Hi guys this is my first post and I'm relatively new to unity so any help will be very much appreciated ;)

Ok so I have a palm tree in a scene which works fine when it is being debugged in unity.

However, when I compile my game it looks like this.

As you can see the tree is glowing and the point light I have added to my scene has no affect on the tree and isn't casting shadows , reflecting light, or anything. Why is this happening, is there something wrong with the compiler ?

Notes: I'm using Unity 3 and the tree model I am using comes from the unity standard assets package. Also the trees only glow when you are near them, maybe this is because of the billboards ?

Thanks in advance to any one the answers ;)