I've got:

- 5 inputs ("Scoreboard 1-5") based on a single IP camera, each cropped to show a different portion of the image being streamed
- 10 inputs ("Cameras 1-10") based on 10 different IP cameras, each showing a different area of the playing surface
- 1 color input ("A") that combines "Scoreboard 1-5" inputs in a single view
- 1 colour input ("B") that combines "Cameras 1-5" inputs in a single view
- 1 colour input ("C") that combines "Cameras 6-10" inputs in a single view
- 1 colour input ("D") that combines "A", "B", and "C" inputs in a single view

When I create a new colour input ("Everything") and add the "D" input to it via MultiView, nothing appears.

Is there a limit to the number of layers for inputs? In my case, it's a pyramid with the original sources at the bottom:

Everything
D
A | B | C
Scoreboard 1 | Scoreboard 2 | etc. | Camera 1 | Camera 2 | etc.

I need the "Everything" input because I want to combine additional content with "D", and "D" is already using 3 of 5 MultiView slots.

Thanks for the explanation, Martin. If I'm following you correctly:

Input A
---MultiView 1
------MultiView a
------MultiView b
------MultiView c
------MultiView d
------MultiView e
---MultiView 2
------[...]
---MultiView 3
------[...]
---MultiView 4
------[...]
---MultiView 5
------[...]

So:

- Input A has a Main and 5 overlays (MultiView 1-5)
- Input 1-5 have a Main and 5 overlays (MultiView a-e)

But MultView a-e cannot have any overlays, and must be single inputs (Main only). Is that correct?