Worked: (optional) probably never
Short description of error
when assigning object as duplis to some mesh, and then trying to bake these duplis to another mesh, duplis appear black. But in normals mode, it works, so they are there, just without material or something.
Also, you can see that the duplis are there actually twice, one offset quite strongly. In some other file, I got them also four times...
Exact steps for others to reproduce the error
open the file, hit bake.
the group of objects in the ceter bakes to the cube.
also, you can see another group of objects, where duplis have been made "real" and it works well, it's group of objects called "fine", baking to the cube works well with seemingly same meshes.