Could not build lighting

Development Rendering
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  • Hardware: mac book pro 2013 (intel core i7, 16G memory, 512G SSD)
  • OS: osx 10.9.2
  • UE: 4.0.1, built from source code
  • xcode: 5.1

reproducing way:

  1. create a new project from bp template
  2. add a directional lighting, set the lighting color and checked ‘used as atmosphere sun light’
  3. click ‘Build’
  4. the progress bar on the right bottom corner of the editor window keeps ‘%0’ after about 1 hour
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it was resolved after upgrading the ue4 to 4.0.2