Rhino 7: Materials assigned to layers randomly changing

I have a Rhino 7 file with materials assigned to layers in order to quickly assign materials in Twinmotion. However, often when I re-open the file, the layer materials will have changed. I am the only person working on this file, and the materials are ones which I would never assign (for example, assigning softscape to millwork hardware). Has anyone else experienced this issue?

image

Hi Chris - are these Rhino materials? Are there blocks involved?

-Pascal

Hi Pascal,

They are Rhino materials. Basically just a renamed default plaster material, so that I can quickly replace the material in Twinmotion. No blocks involved.

Thanks!

Chris

Hi Chris - can you please send an example file (the smaller the better, as long as it shows the problem) to tech@mcneel.com, with a link back to this topic in your comments?

-Pascal

Hi Pascal,

Hopefully this file shows the issue. I find it is when I reopen the file that the layer materials will have changed. I have included the layers above, which seem to be the most likely to change.

Layer change example file.3dm (2.8 MB)

Hi Chris - as the file opens, the materials look like this:
image

Is that what you expect? Is that not what you see? What should I do to make it do the bad thing?
Are you saving the file locally, or on a network, or a GoogleDrive.DropBox type thing?

-Pascal