Why did my scene turn red?

I opened my project like everyday and everything is covered by red light. Didn’t change anything and it was working fine for months. I open it today and it’s red doesn’t matter what I do. Tried switching all objects off and on. Deleting them and inserting them new the red light keeps being here. I tried opening it in both 4.18.3 in which I worked before and in the newest update too but it doesnt matter. What went wrong?

Hello,

We’ve recently made a switch to a new bug reporting method using a more structured form. Please visit the link below for more details and report the issue using the new Bug Submission Form. Feel free to continue to use this thread for community discussion around the issue.

https://forums.unrealengine.com/unreal-engine/announcements-and-releases/1410408-unreal-engine-bug-submission-form

Thanks