"Your scene has been created or edited with a non-legitimate Forest license. Disappearing items are part of our protection system.
Please check if you have imported the Forest object from an external source (downloaded from Internet, third-party freelancer, etc.).
We cannot check the origin of your scene, but for sure the object included on it was created using a non-legitimate license."
This just occurred to me. If the scene was created with an illegitimate forest license then shouldn't it have issues on your computer too? I believe I provided the original landscape file scene earlier in this thread. If it works fine on your machine but has random occurrences of some or all forest objects disapearing on my machine then what does that mean? I have an installed/activated a legit forest license on my machine.
I bought the scene from a 3d site. The only changes I did were importing the car, scaling the car to match the scene and importing the sign and scaling the sign to match the scene.
And then I made the setting changes suggested on this thread.
Sorry. I'm just trying to think this through to get to the root cause.