I managed to block the material flow on the splitter:
Blocking splitter.PNG
I suspect the steel blocks it on the bottom line, but if there is another reason, here is how I managed it:
First I put the steel the wrong lane where I expected the engines to go and when I noticed It already filled up.
I ...

This is a problem which I also have in different situations. (Another example when they fly over enemy territory because that is the shortest.)
I think the solution would be if for the robots leaving the roboport area shouldn't allowed, and if they get outside then they should hurry back to the ...

What did you do?
- In the position where I stand in the autosave I started a deconstruction on the right side of the train line for the signals up until I reached the half pipe. (Seen in the picture)
What happened?
- Insted of deconstruction it chrashed.
- This is reproducable. (I had already this ...

1. What did you do?
I just right clicked my first blueprint book on the shortcut bar
2. What happened?
It crashed instantly

This is repeatable on my PC.