Probably one of the last from me this year. Just playing around with some Blue Marble resources from
Visible Earth.
I used four 21600x10800px maps of the Earth; Colour, topography, bathymetry and night-lights on this TG planet with no problems.
I did have a fifth map loaded(cloud cover@8192x4096px) which also worked fine but I didn't like the result of the pattern. I just used fractals for the clouds, which I'm pleased to note, did not suffer the 'terminator cut-off bug'.
I
think, if you keep the 3D cloud layer low enough to the surface, the cut-off line isn't a problem. The cloud base min' here is 250m above the ground and no terminator problems. When I was testing I was finding the bug when my cloud base min' was above 1000m.
* I'm not certain that this is the solution but it's working here, anyway.
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Cheers for looking!