Beast Lightmapping and modular level design issues

Hi All,
I’m trying to create a scene with only a child’s room at night. For this a created a set of modular walls meshes in unity and imported them into unity. When I try to bake the lighting all the single modules of the scene have different lighting, why is this happening? I checked “Generate Lightmap UV’s” in the import settings. Anyone?

Not Lightmapped:

Lightmapped:

(note: I added a ceiling for the lightmapping process and then removed it when it was done)

This even happens with a default scene, with default lighting, and default lightmap settings. Is it a bug in Unity?

I can get rid of it if I remove the inner faces (the ones that are against the next block). I’ll stick to this solution for now but I think this is something that should get fixed