Yup when you duplicate a object, the clone loses the original material and is replaced by the default grey material.
I dont see why anyone would want this option enabled? :o And I still cant find where to disable this...
Heres a video (because screentoaster is cool); http://www.screentoaster.com/watch/s...1ZQVhcX1JdUldW
Edit; seems like its not actually replaced with default grey material... its replaced with a new material that has the same properties as the old material, but loses the diffuse map?? I say this because the current texture on the tree has 100% self illumination atm, and a 100% self illum grey material ends up looking white.
If I clone the object while it has a 100% self illum material, the clone will also have a 100% self illum grey texture, but if I clone the object while it has 0% self illum, then the cloned texture is the default grey one.
I'm sure I could have typed this in much fewer words but whatever, its done :p