Steps to repro:
1. Create a new project and a scene
2. Add some basic GO
3. Mark them static
4. Let it bake
5. Uncheck 'Continious baking'
6. Press play - observe that no shadows are displayed, the scene is completely white
7. Save the scene
8. Rebake the lightmap
9. Observe errors:

Error adding system: Failed to allocate system.

EnlightenRuntimeManager::Update - Failed to update manager.

Lightmapped renderer has no UV mesh!

Reproduction steps on video: http://screencast.com/t/Orftqj8exaF