Please, try this:
1) Download the
Dependency Walker tool.
2) Run it from one the problematic render nodes.
3) Open
Options->Configure Module Search Order.
4) Click the
Browse button and pick your Max root folder.
5) Click
Add Directory to add the Max path to the list, and close the dialog with
Ok.
6)
File->Open and pick
ForestPackPro.dlo from the Max "plugins" folder.
7) Once dependency check is completed, use
File->Save to save the results into a .dwi file and sent it to us.
Hopefully that should give us a clue about the problem.