It's because of surface tiles used by Canaveral base. Surface tiles don't use night lights, and they are covering the level 14 Earth (Florida) textures, and that's the cause for night lights not showing up for that area.

That was also the case for Orbiter 2006, but then, the area covered by Canaveral surface tiles was smaller than in Orbiter 2010, so it was less noticeable, but if you used an add-on, that covered a larger part of land (for example, surface tiles for Europe, Australia, etc.), there were no night lights for that part of land too (more noticeable for Europe, because it's connected to Asia, which with surface tiles of Europe would have night lights shown, but for whole Europe there would be black out).

Thanks Orb, it's a small thing and I can live with it. I just thought there might be a patch or fix of some kind. The rest of the earth looks good at night now.

It would be nice if you could add light maps to surface tiles somehow. Something like another semi-transparent layer which would show up at night.

I can confirm that night lights on top of surfbase tiles are currently not supported.

A fix is not a high priority at the moment, because I would rather get rid of the surfbase tiles altoghether by merging them into the general planetary tile manager mechanism.