Material icons show as black

Version 8 SR17
(8.17.25043.10001, 2025-02-12)

The icons for the material swatches on my model began showing as blank.

New materials loaded now show blank icons, although the material can be applied to the model correctly.

This bug shows in new models - eg a simple box.

Ive attached
blank_swatch.3dm (308.2 KB)


a screen grab & the model

Saving this file as V7 displays the material icon correctly.

cheers
rabbit