The problem I had with copymesh, was that my trees (which have an alpha and transparant texture, and a solid texture) weren't displayed properly, the alpha+transparant textured polygons (the leaves) weren't displayed all the time, they kept desappearing when they still should have been visible. When sipmly using loadmesh(), they were displayed correctly.
So you should try copying them, but if you're having problems with that, you should change it back to loading them all :)
So you should try copying them, but if you're having problems with that, you should change it back to loading them all :)