Hello everybody! I had the same problem and I realized that Unity3D 4.3.2.0 show a small 'problem' as follow :
" For each import matéria. Unity first looks for an existing material named [Base Texture Name]. Unity will do a recursive-up search for it in all Materials folders up to the Assets folder. If it doesn't exist, a new one is created in the local Materials folder ".
This problem is in folder that you extract the previous object.blender, because everything object.blender that you save in your 'folder objects', the Unity3D 4.3.2.0 creates a 'pattern folder' calls 'Materials' with properties and texture of each object.blender and if you try save objects in the same folder, the Unity will notify this problem: 'Blend cannot convert .blend file to FBX'.
I fixed this problem by creating a new folder for each object.blender that I saved or imported the object in my Unity Project. Note that Unity3D creates a folder called 'Materials' for each object, if you save the object.blender in the same folder, the Unity3D will do a overload in the folder called 'Materials'.
I had the same problem and I managed to fix it that way. I don't know exactly if is the same problem, but this is my suggestion ! :) Bye Bye.
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