Basically, I was exporting flat coplaner surfaces (airfelid grass, factory grass, runways, lots, ect..) and changing a texture, renaming them and then saving and exporting back into the object editor.
That way I could have some new objects for use.
Well the zbias never worked once in the Terrain editor and once the map was built.
So I went and opened the exported ac3d files with notepad and changed the texture name line only to the textures I was doing...
Imported those back into the object editor - same thing...
then I went into ac3d and added the Zbias=16 line in the heiracrhy. Zbias=16 is what they use for ground / runways.
Anyway - that didn't work...But one of the files by mistake I had typed zbias=1, and that one worked...lol
also one of the axis' is getting reversed from what you see in ac3d, to what shows up in object editor, so o spent a good hour trying to see if that was the cause in some way...lol
I guess without the zbias tag - even the sorting order on the object editor wont work correctly.
