Light cut in half

[MatiCekuriel]

Hi !
I'm trying once again to create a CS in Soma, but I'm having an issue : the point lights and spot lights are cut in half :
It only do it in the level editor, it's working fine in game and the map viewer, but that's still a problem as you can guess :/

Spoiler below!

It's not coming from the plane, it's doing this with every texture, walls, etc.
Do you have any idea how to fix this ? :/
Thank you !

[MatiCekuriel]

Okay so I checked the troubleshooting in the wiki, but from what I understand it is only for custom or imported materials...

[TiManGames]

Okay so I checked the troubleshooting in the wiki, but from what I understand it is only for custom or imported materials...

Incorrect. 
This happens because the editor is using your integrated graphics card instead of your GPU. Check your control panel to make sure the editor uses your GPU.

[MatiCekuriel]

Thank you, you just saved my life!