I will do that. Thank you so much for trying to help me :) I appreciate it a lot :D

OK

Is it just Trees?

What about Grass or any other Prop or Test Project?

I'm stumped & have run-out of ideas.

Basically; you can Open & Save stuff, but it doesn't show in the Viewport if you re-Open it. But it does show in Scene Manager.

All I can suggest now, is that you send Reallusion a Support "Ticket", quoting the above.

I'll include a Link re; how to do that, if & when I can find it.

ADDED - Link: https://forum.reallusion.com/Topic55-13-1.aspx

You might have to wait a bit for a Reply, because Reallusion are currently overwhelmed with resolving iC6 problems.

Good luck :)

-----------------------------------------------------------------------------------------

      REALLUSION FORUM ANNUAL PINHEAD COMMUNITY PROJECTS.

       New Pinhead Website & Project to be announced in September 2015

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To be sure, I tried the 4 different ways to save a project: with the +, with the button, with the pop up menu and with the drop down menu: ans the result is always the same... :(

Have you tried Project / Save Button & Tools Drop-down / Save Project ? 

Either way, when you Close iclone, don't Select Save Project again, in the following Pop-up. Select No..

I'm in the UK. It's well-past my bed time ;)

-----------------------------------------------------------------------------------------

      REALLUSION FORUM ANNUAL PINHEAD COMMUNITY PROJECTS.

       New Pinhead Website & Project to be announced in September 2015

-----------------------------------------------------------------------------------------

 

P.S. In some of the 3D scenes I bought earlier from Reallusion, I have the same problem, even if it isn't scenes that I saved recently: in some of the scenes of the pack World Wildness, I can't see the trees anymore, but in others, I still can see them.

If it is a new project, it shows, as in any other cases. But once the project is saved and I reopen it, it dosn't show, even with the home button.

OK

1) Select "American Elm" in Content Manager & then Tool Bar Home Icon, to see if it shows.

2) If it does, Select any Object. Place that on the World Axis & Link American Elm to that. Select  "Position", in following Pop-up. If it then shows, un-link it & Delete the Object.

-----------------------------------------------------------------------------------------

      REALLUSION FORUM ANNUAL PINHEAD COMMUNITY PROJECTS.

       New Pinhead Website & Project to be announced in September 2015

-----------------------------------------------------------------------------------------

 

I've made 2 screenshots to show the problem and the parameters.

My drivers are all updated. I'm saving my projects in the default directory, but I tried saving them on my desktop and it didn't change a thing. Opening the projects with quick shading, smooth shading or wireframe does not change a thing. This problem is a real mistory to me, since I didn't have it before...

Here are the details:

XPS 730X Intel Core3 I7-975
Nvidia GeForce GTX 295 SLI
12GoMulti-Canal DDR3 à 1066mHz
Windows 7 64 bit
I still have 158 Go available
All the drivers are up to date.

I have this problem only with trees and it doesn't make sense at all:
I didn't have it before. I still can see the trees I add to a scene, animate them and make a render. I just cant't save them in a project or a 3D scene. If I do, though, I will see them appear on the thumbnail, but they won't appear in the scene when I open the project...