Actually, it works only if I explode the trees group in question: than I can hide some of them, update that page, and keep seeing them in the other pages.
That also means one cannot edit that play list anymore!
By the way, where are the render lists of a project gone?
When I opened the project to check the above, I thought I would also open Skatter to check if the “Render only” is unclicked, like you said (which it was): but no more render lists!?!
I thought a project always remembers its’ playlists…
After checking an earlier saved copy of the project, the render lists were there.
The main project was probably altered (and lost its render lists) when I had to brutally shut down the PC to abort a for ever rendering with TWILIGHT: sometimes there is no other way to stop a long render!
Remains the question of not having to explode the Skatter group of objects in order to hide some in some scenes.