Building Lightning stuck at 5%

Development Rendering
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1

I had my lightning build stuck at 35%. After this I’ve tried some solutions found on the forums:

  1. Added the "Floo"r mesh
  2. Deleted lightmass importance volume

The result is that it is now stuck at 5%…
Does anyone know other ways to fix this ?
Thanks

2

My guess is that your level is very big (or full of objects), and the lightmass importance volume made it easier for the lighting to be built. How long is it stuck for? I’ve waited for hours building some maps on production quality settings, but they’ve always finished.