Here is the tip from Elin rgd the extra repl material: Go inside the file and check the materialnames in the Material Editor. There you will find it written; "baked_baked_replace_material_fire_surround " on the material you have added to the surroundobject. This you will find in Ogre, Unity or Photo. Then you must delete the first or both "baked_" and then export the actual file again :)