I`m using 3Ds Max 2015 and when im exporting the model as a FXB 2013 it wont export the materials.
The materials are .TIF images. Im testing the ATree plugin to make trees, until SpeedTree shows up Heres what my setup looks like:
http://s26.postimg.org/dmbsj8ee1/No_Material.jpg
The white spheres is whats supposed to be the bark and the leaf-materials. The tree works fine.