Big black spot bug

Hi there!
I have a big problem coming from nowhere. I have this interior scene in unreal 4.16 that hasn’t been open for like a month and now there is this king of black mess up anti aliasing.
Even the meshes in the content have this problem.
I wanted to know if one of you guys had this bug before and how to fix it.
tank you for your help
it will be appreciate
:slight_smile: