Forestpack resets custom material? (VRay-5)

[DM5847]

We use the forestgrass presets for the geometry and then assign our own grass material. That has worked fine for months now.

However I'm finishing off a scene and it seems to reset the material assignment when re-opening the file. So now I have a grass field which was colour toned correctly 20min. ago and now the grass is the original FP material which is too green for our scene.

What's going on?! I was just about to finish the project and render highres images....

Latest FP/RC
3dsmax 2018
Vray5 hotfix2

[DM5847]

Right, think I found the culprit. I run the vraysceneconvertor at the end when finalising the file for the final renders in case any old stuff is in a library model.

I think that resets the grass as I just re-did the material and saved (without using the scene convertor now) and loaded the file back into the master as an xref and colour/custommaterial is correct again.