shaders get worse after building light!

Hi,
i have a weird problem, and probbably its so easy to fix that i dont see it! (i hope:)
When i import my objects in the Unreal levels it looks okay,… but once i build the light the shaders get all square and ugly. Usually i make the objects in blender and export the .fbx to Unreal. It hasnt happenend before, and now it happens all the time, with all objects, in any level! :rolleyes:

I made a quick setup to show what’s happening. Does anybody have an idea what i do wrong?https://youtube.com/watch?v=zvIfBLPKsH0
best regards robert

Hello!

Do you have a lightmass importance volume drawn around your objects in the map?

And you can check out a tutorial on how to set up your scene properly here:

Cheers

http://www.worldofleveldesign.com/categories/ue4/ue4-how-i-created-the-corridor-environment-in-10-hours.php