Hi Stiebler,
thanks for your reply. I tested the save-game issue with ships in the scr layer again and could not reproduce it

I remember that I tested it long time ago when there was a discussion about the harbor traffic that loses its waypoints. Since it was long ago, I don't remember what I tested exactly.
Anyway, I just want to mention that I'm not sure anymore about the save-game issues with units in the scr layer.
Cheers, LGN1