I just tested something and this is extreeeeemely weird:

One of the ecosystems that's crashing is one I made a few months ago with 3 eco layers - trees, grass and houses.  (The houses are simple onesmade with Vue primitives)

By process of elimination, the houses ecosystem layer is the one that's crashing Vue 8.

So, in 7, I deleted all the houses in that layer and replaced them with one simple sphere.

The resaved mat loaded in 8 without a hitch.

Then, still in 8 I deleted the temporary sphere and reloaded the houses into the ecosystem layer and saved it.

Now loaded exactly the same material that was crashing, only difference is that the houses were added in 8 and it loaded and populated without a crash.

Think this needs reporting to e-on........

Gill