Hi,
We've received your scene and did testing with it. Most probably the plug-in is not properly installed on some of your render nodes or it's from a different version. Please double check you are using the
same release on all render nodes (also
same 32/64 bits version).
If so, I would suggest you for each slave node:
1) Be sure 3ds Max and VRay Spawner are stopped.
2) Delete
ForestVRay150sp3.dll,
ForestVRay20.dll and
ForestVRay30.dll from the Max root folder (some files may not exist, depending of the VRay version), and
ForestPackPro.dlo from "plugins".
3) Reinstall Forest Pack using the setup program, or manually as described
here.
That should fix it.
Kind regards,