I kind of just... talked my way into it. You know?

Thanks Wyvern! :D

Well, then - I was trying to solve a problem that didn't exist ;)

Nice work, Ede :)

I think the black spots showing through are something we call transparency acne. It's caused by incidental match between the colour of an underlying pixel and the current sheet, so something under the grass sheet is causing bits of it to 'drop out'. It's a weakness of the current rendering engine - one that we hope to put right in the future, but for now I have updated the fills of that style to try and prevent this from happening.

It might be ok on this map, but if you want to make it easier to prevent this kind of thing happening again in the future on other maps, where it might not be so desirable, you could try re-downloading the issue and reinstalling it to get the improved textures.

If you have already done that, then the TA is probably being caused by a sheet effect on the underlying sheets. At present there is no cure for that except a separation sheet. If you need one in the future, a separation sheet works a bit like carpet underlay, if you imagine the dead grass as the carpet. You create a new sheet underneath the dead grass, copy the dead grass polygon to the new sheet, turn the polygons on the new sheet to solid, colour number 227 using the Change Properties tool, and add a slightly larger edge fade inner effect to prevent it from showing around the edges of the dry grass.

Well? We're pros at this game :)

That must surely be a secret, Remy ;)