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FBX imported to UE - problem with light building

Hi Everyone :slight_smile:
I have a problem with the fbx scenes imported to UE4. Just after import the scene looks pretty nice:

https://forums.unrealengine.com/filedata/fetch?filedataid=148146&type=thumb

…then I add some directional light to the scene and everything is ok:

https://forums.unrealengine.com/filedata/fetch?filedataid=148148&type=thumb

…but after building the light… a craziness happens!:

https://forums.unrealengine.com/filedata/fetch?filedataid=148147&type=thumb

it happens again and again! What do I make wrong? Thanks for any idea!