Cleanshot disabled by mapmodel?

[Mael]

Seems like that would explain it. If the script clears the hud and takes the screenshot just 20ms later you'd need to render the next frame before the screenshot command is executed, in this case probably ~20ms.

500ms is probably overkill but I'm sure you can spare half a second to take an image. I'm impatient so I'd go with 200ms.