Materials showing in SS6, but were not in SS5

Hello

I have a project that I have just migrated to SS6.

Previously in SS5, I pretty much did all the modelling in Illustration Display Style. The materials that were applied, via the Dataset (only a handful actually) did not show up.

Now in SS6 they do. These are the elements in grey/painted steel in Image 1.

They should show up using the ByLevel colours (as shown in the 2nd image)

I can't seem to be able to turn the dispaly of materials OFF. Maybe the related Family and Part, P4, A-P414 Steel, protected steel, did not have a 'material' property set in SS5 (seem to think it did)

Related, the 'material' toggle has gone in SS6, ..... seems it wasn't there in SS5 either, ...... I'm losing track but when did that dissapear for the View Attributes Dialog box.

Is the intention that the materials (as set in the Dataset) are always ON, when using a shaded view Display Style? if so, this is very undesirable for reasons which I can expand on in due course

Image 1

Image 2