Unreal Engine 4.18 Released!

Experiencing some very serious issues with the PHAT Editor in 4.18, old physics assets that worked without issues in all older engine revisions now go crazy if you try to simulate them. Same happens with the creation of new ones, especially on the head part, no matter how you place the body it will always freak out. Has anyone else experienced this?

I can provide example content if required to check this out.