Imported object being lit from wrong direction I've got a problem where some imported objects are lit from the wrong direction. 
See center object below. 
Normals are ok.
I assume there's some sort of transform linked to the object, but I can't see how or where to reset it.

Any tips much appreciated.
Fixed: Face and vertex normals were okay. 
However, Blender tries to auto generate vertex-per-face normals and get all mixed up. 
Once you turn this off, all works just fine. 
Thanks to this post for the solution: How to unify face and vertex normals