Hi
After several months, this studio called us again for a new job, so we've spent some time testing it again. Let me explain it step by step.
In my computer (7.41 version), I create 2 simple surfaces to populate them with trees.
In one of them, I put some bushes with "Generate" order. I leave them as they are.
In the second surface, I place some tress, also with "Generate".
Now I want to move some of the trees individually, so that I select them and I click on Items Editor --> Custom Edit.
Warning message --> "Switching to Custom Edit mode..." --> Yes
Now I move some trees individually. I can see in Items Editor: "12 Items in Object"
I save the model, and I send it to the architects with the 6th version.
When they open the model, they can see the bushes correctly on the first surface, but they see the second surface empty, with the "F" on it.
If they select this "F" item, it displays "0 items in object". So that it seems that the problem is in the way that Forest 7 storages the information about individual items. I think it's not compatible with the 6th version.
You can find attached the model.