Looking good :)

Have you considered using a Fresnel shader and the 'Pointiness' input of the coals to shade them?

Here I've made a crude burning coal shader by combining a regular dark stone texture with just such a combination.

Looks pretty good, Jim :)

Thanks for explaining, Remy :)

Oh you won't get any practical help until after 20 June, when I hand everything over for MD ;)

But after that I have breathing space to be more generous.

Hi Jay - it's me, Sue Daniel from the FB Group :)

Thanks for showing us a screen shot. That helped to see the problem a lot better.

I've not seen this happen before. A quick discussion with Remy, and he came up with the suggestion that you try reinstalling the latest update, and if that doesn't help to send this to Tech Support for advice.