Sequencer black screen with white box

I’ve had this problem for a really long time and it’s really frustrating I can’t figure out a fix for it.
Each time I try to render a sequence the movie preview stays black with a white box at the bottom right.
I tried some suggestions for similar problems, for ie. deleting all sequences that reference another level etc. But nothing seems to have worked.

I am using UE 4.16

Does this happen in PIE? Can you share a screenshot of your sequence?

You mean generally? No, my sequence is empty so I can play from the player’s camera and render it. But it won’t work. It’s the same on the other sequences that have actual camera movement and object transform changes.

What I tried is to isolate the part of the terrain that this sequence is playing on and move it to another level, but it only works if I reimport everything so I don’t keep the content that is placed on that level.
It happens on all sublevels of my main world composition level.

Not sure I understand. If your sequence is completely blank the movie render will render from the default player position since you’re not indicating what camera to look through. If you have a camera you want to render through, you’ll need to create a camera cut track and point it at the camera you want to render from:

https://docs.unrealengine.com/en-us/Engine/Sequencer/HowTo/TracksCameraCut

No, my point is that none of them works on the game map, doesn’t matter if they have a camera cut or not. Even the ones like with a cut like on the image below, all of them go black and freeze the engine, that is the problem.
But I found a temporary solution just redoing the maps on another level without world composition works.