When resizing editor windows, the user can see odd rendering around that window. It renders white and it takes a moment to catch up to match the user resizing it.
This was seen with Physical Material editor, Enum editor, and Blueprint editor.
In the lower right corner, the editor space renders white and seems to have trouble catching up.
There's no existing public thread on this issue, so head over toAnswerHub just mention UE-41847 in the post.