As you can see, the movement/rotation gizmo is really weird and jittery and low quality.
the movement of the viewport camera is also jittery and so is actor movement, and there’s weird flashing etc.
Basically everything is weird and shaky. The one thing I can say is that on this map I have a very large actor for the landscape, so I don’t know if this is a bug with scale or what…
Here are some examples: